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Ensure _.bind works with ES6 class constructors. [closes #1193]

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jdalton
2015-05-08 09:49:54 -07:00
parent 542dd67892
commit a61bde5b78
2 changed files with 40 additions and 4 deletions
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17
lodash.src.js
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@@ -828,8 +828,8 @@
}());
/* Native method references for those with the same name as other `lodash` methods. */
var nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray,
nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
var nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray,
nativeIsFinite = context.isFinite,
nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
nativeMax = Math.max,
@@ -3419,8 +3419,19 @@
*/
function createCtorWrapper(Ctor) {
return function() {
// Use a `switch` statement to work with class constructors.
// See https://people.mozilla.org/~jorendorff/es6-draft.html#sec-ecmascript-function-objects-call-thisargument-argumentslist
// for more details.
var args = arguments;
switch (args.length) {
case 0: return new Ctor;
case 1: return new Ctor(args[0]);
case 2: return new Ctor(args[0], args[1]);
case 3: return new Ctor(args[0], args[1], args[2]);
case 4: return new Ctor(args[0], args[1], args[2], args[3]);
}
var thisBinding = baseCreate(Ctor.prototype),
result = Ctor.apply(thisBinding, arguments);
result = Ctor.apply(thisBinding, args);
// Mimic the constructor's `return` behavior.
// See https://es5.github.io/#x13.2.2 for more details.