Version 1

[yaffs-website] / node_modules / core-js / modules / _array-copy-within.js

diff --git a/node_modules/core-js/modules/_array-copy-within.js b/node_modules/core-js/modules/_array-copy-within.js
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+// 22.1.3.3 Array.prototype.copyWithin(target, start, end = this.length)
+'use strict';
+var toObject = require('./_to-object')
+  , toIndex  = require('./_to-index')
+  , toLength = require('./_to-length');
+
+module.exports = [].copyWithin || function copyWithin(target/*= 0*/, start/*= 0, end = @length*/){
+  var O     = toObject(this)
+    , len   = toLength(O.length)
+    , to    = toIndex(target, len)
+    , from  = toIndex(start, len)
+    , end   = arguments.length > 2 ? arguments[2] : undefined
+    , count = Math.min((end === undefined ? len : toIndex(end, len)) - from, len - to)
+    , inc   = 1;
+  if(from < to && to < from + count){
+    inc  = -1;
+    from += count - 1;
+    to   += count - 1;
+  }
+  while(count-- > 0){
+    if(from in O)O[to] = O[from];
+    else delete O[to];
+    to   += inc;
+    from += inc;
+  } return O;
+};
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