vamp

/**
 * Transform for Knockout 3+
 * (c) Denis Gulin
 * License: MIT (http://www.opensource.org/licenses/mit-license.php)
 */
!function (factory) {
    // Support three module loading scenarios
    if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
        // [1] CommonJS or Node: hard-coded dependency on "knockout"
        factory(require("knockout"));

vamp

function validate(board) {
    const input = getArray(board);
    const predicates = [
        hasValidStructure,
        createDataValidator([9, 1]),
        createDataValidator([1, 9]),
        createDataValidator([3, 3])
    ];

    const isValid = predicates.every(fn => fn(input));