time-to-botec

Benchmark sampling in different programming languages
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startsWith.js (1017B)

      1 var baseClamp = require('./_baseClamp'),
      2     baseToString = require('./_baseToString'),
      3     toInteger = require('./toInteger'),
      4     toString = require('./toString');
      5 
      6 /**
      7  * Checks if `string` starts with the given target string.
      8  *
      9  * @static
     10  * @memberOf _
     11  * @since 3.0.0
     12  * @category String
     13  * @param {string} [string=''] The string to inspect.
     14  * @param {string} [target] The string to search for.
     15  * @param {number} [position=0] The position to search from.
     16  * @returns {boolean} Returns `true` if `string` starts with `target`,
     17  *  else `false`.
     18  * @example
     19  *
     20  * _.startsWith('abc', 'a');
     21  * // => true
     22  *
     23  * _.startsWith('abc', 'b');
     24  * // => false
     25  *
     26  * _.startsWith('abc', 'b', 1);
     27  * // => true
     28  */
     29 function startsWith(string, target, position) {
     30   string = toString(string);
     31   position = position == null
     32     ? 0
     33     : baseClamp(toInteger(position), 0, string.length);
     34 
     35   target = baseToString(target);
     36   return string.slice(position, position + target.length) == target;
     37 }
     38 
     39 module.exports = startsWith;