import is from '../lang/is';
import isArray from '../lang/isArray';
import every from './every';

/**
 * Compares if both arrays have the same elements
 */
function equals(a, b, callback = is) {
    if (!isArray(a) || !isArray(b)) {
        return callback(a, b);
    }

    if (a.length !== b.length) {
        return false;
    }

    return every(a, makeCompare(callback), b);
}

function makeCompare(callback) {
    return function(value, i) {
        return i in this && callback(value, this[i]);
    };
}

export default equals;