Switch/Case/Else - Switch statements in JavaScript are fundamentally broken. You can only - do string comparisons, and need to break at the end of each case - statment to prevent falling through to the default case. CoffeeScript - compiles switch statements into if-else chains, allowing you to + Switch statements in JavaScript are rather broken. You can only + do string comparisons, and need to remember to break at the end of + every case statement to avoid accidentally falling through to + the default case. CoffeeScript + compiles switch statements into JavaScript if-else chains, allowing you to compare any object (via ===), preventing fall-through, and resulting - in a returnable expression. + in a returnable, assignable expression. To specify the default case, just + use else.
<%= code_for('switch') %> diff --git a/documentation/js/switch.js b/documentation/js/switch.js index 36a2a15e..53406faa 100644 --- a/documentation/js/switch.js +++ b/documentation/js/switch.js @@ -4,7 +4,10 @@ } else if (day === "Wednesday") { go_to_the_park(); } else if (day === "Saturday") { - day === bingo_day ? go_to_bingo() : null; + if (day === bingo_day) { + go_to_bingo(); + go_dancing(); + } } else if (day === "Sunday") { go_to_church(); } else { diff --git a/index.html b/index.html index 6f5e195c..bd610f4d 100644 --- a/index.html +++ b/index.html @@ -505,6 +505,12 @@ var three_to_six = nums.slice(3, 6 + 1); Base2, Prototype.js, JS.Class, etc. + The libraries provide syntactic sugar, but the built-in inheritance would + be completely usable if it weren't for one small exception: + it's very awkward to call super, the prototype object's + implementation of the current function. CoffeeScript converts + super() calls into calls against the immediate ancestor's + method of the same name.Animal: => . Animal.prototype.move: meters => @@ -631,18 +637,22 @@ let_the_wild_rumpus_begin() unless answer Switch/Case/Else - Switch statements in JavaScript are fundamentally broken. You can only - do string comparisons, and need to break at the end of each case - statment to prevent falling through to the default case. CoffeeScript - compiles switch statements into if-else chains, allowing you to + Switch statements in JavaScript are rather broken. You can only + do string comparisons, and need to remember to break at the end of + every case statement to avoid accidentally falling through to + the default case. CoffeeScript + compiles switch statements into JavaScript if-else chains, allowing you to compare any object (via ===), preventing fall-through, and resulting - in a returnable expression. + in a returnable, assignable expression. To specify the default case, just + use else.switch day case "Tuesday" then eat_breakfast() case "Wednesday" then go_to_the_park() case "Saturday" - if day is bingo_day then go_to_bingo(). + if day is bingo_day + go_to_bingo() + go_dancing(). case "Sunday" then go_to_church() else go_to_work().if (day === "Tuesday") { @@ -650,7 +660,10 @@ let_the_wild_rumpus_begin() unless answer else if (day === "Wednesday") { go_to_the_park(); } else if (day === "Saturday") { - day === bingo_day ? go_to_bingo() : null; + if (day === bingo_day) { + go_to_bingo(); + go_dancing(); + } } else if (day === "Sunday") { go_to_church(); } else {