@extra-array/find-index/index.js

Finds index of leftmost value passing a test.

'use strict';

var extraIterable = require('extra-iterable');

/**
 * Finds index of leftmost value passing a test.
 * @param x an array
 * @param ft test function (v, i, x)
 * @returns index of value, -1 if not found
 */
function findIndex(x, ft) {
    return extraIterable.search(x, ft);
}

module.exports = findIndex;