Version 1

[yaffs-website] / node_modules / core-js / library / modules / es6.array.last-index-of.js

diff --git a/node_modules/core-js/library/modules/es6.array.last-index-of.js b/node_modules/core-js/library/modules/es6.array.last-index-of.js
new file mode 100644 (file)
index 0000000..75c1eab
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+++ b/node_modules/core-js/library/modules/es6.array.last-index-of.js
@@ -0,0 +1,22 @@
+'use strict';
+var $export       = require('./_export')
+  , toIObject     = require('./_to-iobject')
+  , toInteger     = require('./_to-integer')
+  , toLength      = require('./_to-length')
+  , $native       = [].lastIndexOf
+  , NEGATIVE_ZERO = !!$native && 1 / [1].lastIndexOf(1, -0) < 0;
+
+$export($export.P + $export.F * (NEGATIVE_ZERO || !require('./_strict-method')($native)), 'Array', {
+  // 22.1.3.14 / 15.4.4.15 Array.prototype.lastIndexOf(searchElement [, fromIndex])
+  lastIndexOf: function lastIndexOf(searchElement /*, fromIndex = @[*-1] */){
+    // convert -0 to +0
+    if(NEGATIVE_ZERO)return $native.apply(this, arguments) || 0;
+    var O      = toIObject(this)
+      , length = toLength(O.length)
+      , index  = length - 1;
+    if(arguments.length > 1)index = Math.min(index, toInteger(arguments[1]));
+    if(index < 0)index = length + index;
+    for(;index >= 0; index--)if(index in O)if(O[index] === searchElement)return index || 0;
+    return -1;
+  }
+});
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