_charsStartIndex.js
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_charsStartIndex.js
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			var baseIndexOf = require('./_baseIndexOf');

			/**
			* Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
			* that is not found in the character symbols.
			*
			* @private
			* @param {Array} strSymbols The string symbols to inspect.
			* @param {Array} chrSymbols The character symbols to find.
			* @returns {number} Returns the index of the first unmatched string symbol.
			*/
			function charsStartIndex(strSymbols, chrSymbols) {
			var index = -1,
			length = strSymbols.length;

			while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
			return index;
			}

			module.exports = charsStartIndex;