es6.string.ends-with.js

'use strict';
var $def     = require('./$.def')
  , toLength = require('./$.to-length')
  , context  = require('./$.string-context');

// should throw error on regex
$def($def.P + $def.F * !require('./$.fails')(function(){ 'q'.endsWith(/./); }), 'String', {
  // 21.1.3.6 String.prototype.endsWith(searchString [, endPosition])
  endsWith: function endsWith(searchString /*, endPosition = @length */){
    var that = context(this, searchString, 'endsWith')
      , endPosition = arguments[1]
      , len    = toLength(that.length)
      , end    = endPosition === undefined ? len : Math.min(toLength(endPosition), len)
      , search = String(searchString);
    return that.slice(end - search.length, end) === search;
  }
});