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node_modules/es5-ext/array/#/first-index.js 407 Bytes
2a09d1a4   liuqimichale   添加宜春 天水 宣化
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  "use strict";
  
  var toPosInt          = require("../../number/to-pos-integer")
    , value             = require("../../object/valid-value")
    , objHasOwnProperty = Object.prototype.hasOwnProperty;
  
  module.exports = function () {
  	var i, length;
  	if (!(length = toPosInt(value(this).length))) return null;
  	i = 0;
  	while (!objHasOwnProperty.call(this, i)) {
  		if (++i === length) return null;
  	}
  	return i;
  };