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https://github.com/jashkenas/coffeescript.git
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more underscore examples
This commit is contained in:
Jeremy Ashkenas
@@ -306,18 +306,15 @@ _.reduceRight: obj, memo, iterator, context =>
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# range[idx++] = i;
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# }
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# };
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#
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# /* ----------------------- Function Functions: -----------------------------*/
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#
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# # Create a function bound to a given object (assigning 'this', and arguments,
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# # optionally). Binding with arguments is also known as 'curry'.
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# _.bind = function(func, obj) {
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# var args = _.rest(arguments, 2);
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# return function() {
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# return func.apply(obj || root, args.concat(_.toArray(arguments)));
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# };
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# };
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#
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# ----------------------- Function Functions: -----------------------------
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# Create a function bound to a given object (assigning 'this', and arguments,
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# optionally). Binding with arguments is also known as 'curry'.
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_.bind: func, obj =>
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args: _.rest(arguments, 2)
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=> func.apply(obj or root, args.concat(_.toArray(arguments)))..
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# # Bind all of an object's methods to that object. Useful for ensuring that
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# # all callbacks defined on an object belong to it.
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# _.bindAll = function(obj) {
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@@ -333,36 +330,27 @@ _.reduceRight: obj, memo, iterator, context =>
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# var args = _.rest(arguments, 2);
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# return setTimeout(function(){ return func.apply(func, args); }, wait);
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# };
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#
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# # Defers a function, scheduling it to run after the current call stack has
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# # cleared.
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# _.defer = function(func) {
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# return _.delay.apply(_, [func, 1].concat(_.rest(arguments)));
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# };
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#
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# # Returns the first function passed as an argument to the second,
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# # allowing you to adjust arguments, run code before and after, and
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# # conditionally execute the original function.
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# _.wrap = function(func, wrapper) {
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# return function() {
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# var args = [func].concat(_.toArray(arguments));
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# return wrapper.apply(wrapper, args);
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# };
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# };
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#
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# # Returns a function that is the composition of a list of functions, each
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# # consuming the return value of the function that follows.
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# _.compose = function() {
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# var funcs = _.toArray(arguments);
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# return function() {
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# var args = _.toArray(arguments);
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# for (var i=funcs.length-1; i >= 0; i--) {
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# args = [funcs[i].apply(this, args)];
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# }
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# return args[0];
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# };
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# };
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#
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# Defers a function, scheduling it to run after the current call stack has
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# cleared.
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_.defer: func =>
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_.delay.apply(_, [func, 1].concat(_.rest(arguments))).
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# Returns the first function passed as an argument to the second,
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# allowing you to adjust arguments, run code before and after, and
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# conditionally execute the original function.
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_.wrap: func, wrapper =>
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=> wrapper.apply(wrapper, [func].concat(_.toArray(arguments)))..
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# Returns a function that is the composition of a list of functions, each
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# consuming the return value of the function that follows.
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_.compose: =>
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funcs: _.toArray(arguments)
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=>
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args: _.toArray(arguments)
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args: [funcs[i]].apply(this, args) for i in [(funcs.length - 1)..0].
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args[0]..
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# /* ------------------------- Object Functions: ---------------------------- */
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#
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# # Retrieve the names of an object's properties.
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@@ -394,81 +382,67 @@ _.reduceRight: obj, memo, iterator, context =>
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# if (_.isArray(obj)) return obj.slice(0);
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# return _.extend({}, obj);
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# };
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#
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# # Perform a deep comparison to check if two objects are equal.
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# _.isEqual = function(a, b) {
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# # Check object identity.
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# if (a === b) return true;
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# # Different types?
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# var atype = typeof(a), btype = typeof(b);
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# if (atype != btype) return false;
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# # Basic equality test (watch out for coercions).
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# if (a == b) return true;
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# # One is falsy and the other truthy.
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# if ((!a && b) || (a && !b)) return false;
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# # One of them implements an isEqual()?
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# if (a.isEqual) return a.isEqual(b);
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# # Check dates' integer values.
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# if (_.isDate(a) && _.isDate(b)) return a.getTime() === b.getTime();
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# # Both are NaN?
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# if (_.isNaN(a) && _.isNaN(b)) return true;
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# # Compare regular expressions.
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# if (_.isRegExp(a) && _.isRegExp(b))
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# return a.source === b.source &&
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# a.global === b.global &&
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# a.ignoreCase === b.ignoreCase &&
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# a.multiline === b.multiline;
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# # If a is not an object by this point, we can't handle it.
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# if (atype !== 'object') return false;
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# # Check for different array lengths before comparing contents.
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# if (a.length && (a.length !== b.length)) return false;
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# # Nothing else worked, deep compare the contents.
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# var aKeys = _.keys(a), bKeys = _.keys(b);
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# # Different object sizes?
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# if (aKeys.length != bKeys.length) return false;
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# # Recursive comparison of contents.
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# for (var key in a) if (!_.isEqual(a[key], b[key])) return false;
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# return true;
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# };
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#
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# # Is a given array or object empty?
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# _.isEmpty = function(obj) {
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# return _.keys(obj).length == 0;
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# };
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#
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# # Is a given value a DOM element?
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# _.isElement = function(obj) {
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# return !!(obj && obj.nodeType == 1);
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# };
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#
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# # Is a given variable an arguments object?
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# _.isArguments = function(obj) {
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# return obj && _.isNumber(obj.length) && !_.isArray(obj) && !propertyIsEnumerable.call(obj, 'length');
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# };
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#
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# # Is the given value NaN -- this one is interesting. NaN != NaN, and
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# # isNaN(undefined) == true, so we make sure it's a number first.
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# _.isNaN = function(obj) {
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# return _.isNumber(obj) && isNaN(obj);
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# };
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#
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# # Is a given value equal to null?
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# _.isNull = function(obj) {
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# return obj === null;
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# };
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#
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# # Is a given variable undefined?
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# _.isUndefined = function(obj) {
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# return typeof obj == 'undefined';
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# };
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#
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# # Invokes interceptor with the obj, and then returns obj.
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# # The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.
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# _.tap = function(obj, interceptor) {
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# interceptor(obj);
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# return obj;
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# }
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#
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# Perform a deep comparison to check if two objects are equal.
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_.isEqual: a, b =>
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# Check object identity.
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return true if a is b
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# Different types?
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atype: typeof(a); btype: typeof(b)
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return false if atype isnt btype
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# Basic equality test (watch out for coercions).
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return true if `a == b`
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# One is falsy and the other truthy.
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return false if (!a and b) or (a and !b)
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# One of them implements an isEqual()?
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return a.isEqual(b) if a.isEqual
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# Check dates' integer values.
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return a.getTime() is b.getTime() if _.isDate(a) and _.isDate(b)
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# Both are NaN?
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return true if _.isNaN(a) and _.isNaN(b)
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# Compare regular expressions.
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if _.isRegExp(a) and _.isRegExp(b)
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return a.source is b.source and \
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a.global is b.global and \
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a.ignoreCase is b.ignoreCase and \
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a.multiline is b.multiline.
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# If a is not an object by this point, we can't handle it.
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return false if atype isnt 'object'
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# Check for different array lengths before comparing contents.
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return false if a.length and (a.length isnt b.length)
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# Nothing else worked, deep compare the contents.
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aKeys: _.keys(a); bKeys: _.keys(b)
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# Different object sizes?
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return false if aKeys.length isnt bKeys.length
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# Recursive comparison of contents.
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# for (var key in a) if (!_.isEqual(a[key], b[key])) return false;
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return true.
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# Is a given array or object empty?
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_.isEmpty: obj => _.keys(obj).length is 0.
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# Is a given value a DOM element?
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_.isElement: obj => !!(obj and obj.nodeType is 1).
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# Is a given variable an arguments object?
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_.isArguments: obj => obj and _.isNumber(obj.length) and !_.isArray(obj) and !propertyIsEnumerable.call(obj, 'length').
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# Is the given value NaN -- this one is interesting. NaN != NaN, and
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# isNaN(undefined) == true, so we make sure it's a number first.
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_.isNaN: obj => _.isNumber(obj) and isNaN(obj).
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# Is a given value equal to null?
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_.isNull: obj => obj is null.
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# Is a given variable undefined?
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_.isUndefined: obj => typeof obj is 'undefined'.
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# Invokes interceptor with the obj, and then returns obj.
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# The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.
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_.tap: obj, interceptor =>
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interceptor(obj)
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obj.
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# # Define the isArray, isDate, isFunction, isNumber, isRegExp, and isString
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# # functions based on their toString identifiers.
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# var types = ['Array', 'Date', 'Function', 'Number', 'RegExp', 'String'];
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@@ -478,26 +452,21 @@ _.reduceRight: obj, memo, iterator, context =>
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# _['is' + types[i]] = function(obj) { return toString.call(obj) == identifier; };
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# })();
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# }
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#
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# /* -------------------------- Utility Functions: -------------------------- */
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#
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# # Run Underscore.js in noConflict mode, returning the '_' variable to its
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# # previous owner. Returns a reference to the Underscore object.
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# _.noConflict = function() {
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# root._ = previousUnderscore;
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# return this;
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# };
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#
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# # Keep the identity function around for default iterators.
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# _.identity = function(value) {
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# return value;
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# };
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#
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# # Break out of the middle of an iteration.
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# _.breakLoop = function() {
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# throw breaker;
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# };
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#
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# -------------------------- Utility Functions: --------------------------
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# Run Underscore.js in noConflict mode, returning the '_' variable to its
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# previous owner. Returns a reference to the Underscore object.
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_.noConflict: =>
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root._: previousUnderscore
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this.
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# Keep the identity function around for default iterators.
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_.identity: value => value.
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# Break out of the middle of an iteration.
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_.breakLoop: => throw breaker.
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# # Generate a unique integer id (unique within the entire client session).
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# # Useful for temporary DOM ids.
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# var idCounter = 0;
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@@ -523,19 +492,19 @@ _.reduceRight: obj, memo, iterator, context =>
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# + "');}return p.join('');");
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# return data ? fn(data) : fn;
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# };
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#
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# /*------------------------------- Aliases ----------------------------------*/
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#
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# _.forEach = _.each;
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# _.foldl = _.inject = _.reduce;
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# _.foldr = _.reduceRight;
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# _.filter = _.select;
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# _.every = _.all;
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# _.some = _.any;
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# _.head = _.first;
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# _.tail = _.rest;
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# _.methods = _.functions;
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#
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# ------------------------------- Aliases ----------------------------------
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_.forEach: _.each
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_.foldl: _.inject: _.reduce
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_.foldr: _.reduceRight
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_.filter: _.select
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_.every: _.all
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_.some: _.any
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_.head: _.first
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_.tail: _.rest
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_.methods: _.functions
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# /*------------------------ Setup the OOP Wrapper: --------------------------*/
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#
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# # Helper function to continue chaining intermediate results.
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