code.delx.au - gnu-emacs-elpa/blob - NEWS.md

   1 # History of user-visible changes
   2
   3 ## 20141115
   4
   5 Support for:
   6
   7 * Unicode characters in identifiers (improved).
   8 * [Delegating yield](http://wiki.ecmascript.org/doku.php?id=harmony:generators#delegating_yield).
   9 * [ES6 numeric literals](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-literals-numeric-literals) (octal, binary).
  10 * Harmony [array and generator comprehensions](http://wingolog.org/archives/2014/03/07/es6-generator-and-array-comprehensions-in-spidermonkey).
  11
  12 ## 20131106
  13
  14 Support for:
  15
  16 * [Arrow functions](http://wiki.ecmascript.org/doku.php?id=harmony:arrow_function_syntax)
  17 * [Generators](http://wiki.ecmascript.org/doku.php?id=harmony:generators)
  18 * [Spread operator](http://wiki.ecmascript.org/doku.php?id=harmony:spread)
  19
  20 ## 20130510
  21
  22 ### Support for JSLint global declaration
  23
  24 See the docstring for `js2-include-jslint-globals`.
  25
  26 ## 20130216
  27
  28 ### We don't rebind `RET` anymore
  29
  30 Because well-behaving major modes aren't supposed to do that.
  31
  32 So pressing it won't continue a block comment, or turn a string into a concatenation.
  33 Pressing `M-j`, however, will.
  34
  35 The options `js2-indent-on-enter-key` and `js2-enter-indents-newline` were also removed.
  36
  37 To bring back the previous behavior, put this in your init file:
  38
  39     (eval-after-load 'js2-mode
  40       '(define-key js2-mode-map (kbd "RET") 'js2-line-break))
  41
  42 ## 20120617
  43
  44 ### Support for [default](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/default_parameters) and [rest](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/rest_parameters) parameters
  45
  46 ## 20120614
  47
  48 ### Support for [for..of loops](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of)
  49
  50 ## Older changes
  51
  52 ### Popular indentation style
  53
  54     [foo, bar, baz].forEach(function (v) {
  55         if (validate(v))
  56             process(v);
  57     });
  58
  59     [a, b, c].some(function (v) {
  60         return validate(v);
  61     });
  62
  63 ### Pretty multiline variable declaration
  64
  65 In the original mode,
  66
  67     var foo = 10,
  68     bar = 20,
  69     baz = 30;
  70
  71 In this mode when the value of `js2-pretty-multiline-declarations` is non-nil,
  72
  73     var foo = 10,
  74         bar = 20,
  75         baz = 30;
  76
  77 ### Abbreviated destructuring assignments
  78
  79     let {a, b}       = {a: 10, b: 20}; // Abbreviated   (Not supported in the original mode)
  80     let {a: a, b: b} = {a: 10, b: 20}; // Same as above (Supported in the original mode)
  81
  82     (function ({responseText}) { /* */ })(xhr); // As the argument of function
  83
  84     for (let [k, { name, age }] in Iterator(obj)) // nested
  85         print(k, name, age);
  86
  87 ### Expression closure in property value
  88
  89     let worker = {
  90         get age() 20,
  91         get sex() "male",
  92         fire: function () _fire()
  93     };
  94
  95 ### Fix for odd indentation of "else if" with no braces
  96
  97 In the original mode,
  98
  99     if (foo)
 100         return foo;
 101     else if (bar)
 102     return bar;      // here
 103
 104 In this mode,
 105
 106     if (foo)
 107         return foo;
 108     else if (bar)
 109         return bar;  // fixed
 110
 111 ### Imenu support for function nesting
 112
 113 Supports function nesting and anonymous wrappers:
 114
 115     (function() {
 116       var foo = function() {
 117         function bar() { // shown as foo.bar.<definition-1>
 118           function baz() {} // foo.bar.baz
 119           var qux = function() {}; // foo.bar.quux
 120         }
 121       };
 122     });
 123
 124 Examples of output:
 125
 126 * [jQuery 1.5](https://gist.github.com/845449)
 127 * [Underscore.js](https://gist.github.com/824262)
 128 * [Backbone.js](https://gist.github.com/824260)
 129
 130 For library-specific extension methods like `$.extend` and `dojo.declare`, see [js2-imenu-extras](/mooz/js2-mode/blob/master/js2-imenu-extras.el).
 131
 132 ### Undeclared/external variables highlighting
 133
 134 Original mode highlights them only on the left side of assignments:
 135
 136     var house;
 137     hose = new House(); // highlights "hose"
 138
 139 Here they are highlighted in all expressions:
 140
 141     function feed(fishes, food) {
 142         for each (var fish in fshes) { // highlights "fshes"
 143             food.feed(fsh); // highlights "fsh"
 144         }
 145         hood.discard(); // highlights "hood"
 146     }
 147
 148 Destructuring assignments and array comprehensions (JS 1.7) are supported:
 149
 150     let three, [one, two] = [1, 2];
 151     thee = one + two; // highlights "thee"
 152
 153     function revenue(goods) {
 154         // highlights "coast"
 155         return [price - coast for each ({price, cost} in goods)].reduce(add);
 156     }