Example: Check Data Types with `Lang`

Type Checking with YUI

YUI().use('node', function(Y) {
    // This method is in the core of the library, so we don't have to use() any
    // additional modules to access it.  However, this example requires 'node'.

Checking types

In this example, we use a few of the type-checking methods available in Lang to test various types of data.

// Test the input using Y.Lang type checking methods
var checkType = function (val) {
    return {
        'object'  : Y.Lang.isObject(val),
        'array'   : Y.Lang.isArray(val),
        'function': Y.Lang.isFunction(val),
        'type'    : Y.Lang.type(val)
    };
};

Full Source

YUI().use('node', function(Y) {
    // This method is in the core of the library, so we don't have to use() any
    // additional modules to access it.  However, this example requires 'node'.

    var checkType = function (val) {
        return {
            'object'  : Y.Lang.isObject(val),
            'array'   : Y.Lang.isArray(val),
            'function': Y.Lang.isFunction(val),
            'type'    : Y.Lang.type(val)
        };
    };

    var populateRow = function (e, data) {
        var target = e.target;
            cell = target.get('parentNode'),
            row  = cell.get('parentNode');

        row.removeChild(cell);

        var td0 = document.createElement('td'),
            td1 = td0.cloneNode(false),
            td2 = td0.cloneNode(false);
            td3 = td0.cloneNode(false);

        var results = checkType(data);

        td0.appendChild(document.createTextNode(results['object']   ? 'Y' : 'N'));
        td1.appendChild(document.createTextNode(results['array']    ? 'Y' : 'N'));
        td2.appendChild(document.createTextNode(results['function'] ? 'Y' : 'N'));
        td3.appendChild(document.createTextNode(results['type']));

        row.appendChild(td0);
        row.appendChild(td1);
        row.appendChild(td2);
        row.appendChild(td3);
    };

    var foo = function () {};
    var f = Y.one('#demo');

    Y.on('click',populateRow, '#demo-1', Y, null);
    Y.on('click',populateRow, '#demo-2', Y, []);
    Y.on('click',populateRow, '#demo-3', Y, {});
    Y.on('click',populateRow, '#demo-4', Y, foo);
    Y.on('click',populateRow, '#demo-5', Y, new foo());

});