梁美英 / programming · Files

'use strict';

var value     = require('../../../object/valid-value')
  , toInteger = require('../../../number/to-integer')

  , max = Math.max, min = Math.min;

module.exports = function (searchString/*, position*/) {
	var start, self = String(value(this));
	start = min(max(toInteger(arguments[1]), 0), self.length);
	return (self.indexOf(searchString, start) === start);
};