Version 1

[yaffs-website] / node_modules / core-js / library / modules / es6.array.from.js

diff --git a/node_modules/core-js/library/modules/es6.array.from.js b/node_modules/core-js/library/modules/es6.array.from.js
new file mode 100644 (file)
index 0000000..69e5d4a
--- /dev/null
+++ b/node_modules/core-js/library/modules/es6.array.from.js
@@ -0,0 +1,37 @@
+'use strict';
+var ctx            = require('./_ctx')
+  , $export        = require('./_export')
+  , toObject       = require('./_to-object')
+  , call           = require('./_iter-call')
+  , isArrayIter    = require('./_is-array-iter')
+  , toLength       = require('./_to-length')
+  , createProperty = require('./_create-property')
+  , getIterFn      = require('./core.get-iterator-method');
+
+$export($export.S + $export.F * !require('./_iter-detect')(function(iter){ Array.from(iter); }), 'Array', {
+  // 22.1.2.1 Array.from(arrayLike, mapfn = undefined, thisArg = undefined)
+  from: function from(arrayLike/*, mapfn = undefined, thisArg = undefined*/){
+    var O       = toObject(arrayLike)
+      , C       = typeof this == 'function' ? this : Array
+      , aLen    = arguments.length
+      , mapfn   = aLen > 1 ? arguments[1] : undefined
+      , mapping = mapfn !== undefined
+      , index   = 0
+      , iterFn  = getIterFn(O)
+      , length, result, step, iterator;
+    if(mapping)mapfn = ctx(mapfn, aLen > 2 ? arguments[2] : undefined, 2);
+    // if object isn't iterable or it's array with default iterator - use simple case
+    if(iterFn != undefined && !(C == Array && isArrayIter(iterFn))){
+      for(iterator = iterFn.call(O), result = new C; !(step = iterator.next()).done; index++){
+        createProperty(result, index, mapping ? call(iterator, mapfn, [step.value, index], true) : step.value);
+      }
+    } else {
+      length = toLength(O.length);
+      for(result = new C(length); length > index; index++){
+        createProperty(result, index, mapping ? mapfn(O[index], index) : O[index]);
+      }
+    }
+    result.length = index;
+    return result;
+  }
+});