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e51a424513
* Enable strings category methods tests * Ensure escape, pad, padEnd, padStart, trim, trimEnd, trimStart, unescape return an empty string for falsey values * Coerce value to string using toString in truncate, capitalize and case methods * Ensure createCaseFirst returns an empty string for falsey values
37 lines
989 B
JavaScript
37 lines
989 B
JavaScript
import castSlice from './.internal/castSlice.js'
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import charsStartIndex from './.internal/charsStartIndex.js'
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import stringToArray from './.internal/stringToArray.js'
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const methodName = ''.trimLeft ? 'trimLeft' : 'trimStart'
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/**
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* Removes leading whitespace or specified characters from `string`.
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*
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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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* @returns {string} Returns the trimmed string.
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* @see trim, trimEnd
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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) {
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if (string && chars === undefined) {
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return string[methodName]()
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}
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if (!string || !chars) {
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return (string || '')
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}
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const strSymbols = stringToArray(string)
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const start = charsStartIndex(strSymbols, stringToArray(chars))
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return castSlice(strSymbols, start).join('')
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}
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export default trimStart
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