관리-도구

편집 파일: startsWith.js

var baseToString = require('../internal/baseToString'); /* Native method references for those with the same name as other `lodash` methods. */ var nativeMin = Math.min; /** * Checks if `string` starts with the given target string. * * @static * @memberOf _ * @category String * @param {string} [string=''] The string to search. * @param {string} [target] The string to search for. * @param {number} [position=0] The position to search from. * @returns {boolean} Returns `true` if `string` starts with `target`, else `false`. * @example * * _.startsWith('abc', 'a'); * // => true * * _.startsWith('abc', 'b'); * // => false * * _.startsWith('abc', 'b', 1); * // => true */ function startsWith(string, target, position) { string = baseToString(string); position = position == null ? 0 : nativeMin(position < 0 ? 0 : (+position || 0), string.length); return string.lastIndexOf(target, position) == position; } module.exports = startsWith;