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43 lines
1.2 KiB
43 lines
1.2 KiB
var baseToString = require('./_baseToString'), |
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castSlice = require('./_castSlice'), |
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charsStartIndex = require('./_charsStartIndex'), |
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stringToArray = require('./_stringToArray'), |
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toString = require('./toString'); |
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/** Used to match leading whitespace. */ |
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var reTrimStart = /^\s+/; |
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/** |
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* Removes leading whitespace or specified characters from `string`. |
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* |
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* @static |
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* @memberOf _ |
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* @since 4.0.0 |
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* @category String |
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* @param {string} [string=''] The string to trim. |
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* @param {string} [chars=whitespace] The characters to trim. |
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* @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. |
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* @returns {string} Returns the trimmed string. |
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* @example |
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* |
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* _.trimStart(' abc '); |
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* // => 'abc ' |
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* |
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* _.trimStart('-_-abc-_-', '_-'); |
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* // => 'abc-_-' |
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*/ |
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function trimStart(string, chars, guard) { |
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string = toString(string); |
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if (string && (guard || chars === undefined)) { |
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return string.replace(reTrimStart, ''); |
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} |
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if (!string || !(chars = baseToString(chars))) { |
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return string; |
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} |
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var strSymbols = stringToArray(string), |
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start = charsStartIndex(strSymbols, stringToArray(chars)); |
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return castSlice(strSymbols, start).join(''); |
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} |
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module.exports = trimStart;
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