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;