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

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