$(function () {
var isNumber = function(val){
return !isNaN( val );
};
test("test isNumber with numbers.", function () {
equal(isNumber(10), true);
equal(isNumber("123"),true);
});
test("test isNumber with non-numbers.", function () {
equal(isNumber(true), false); // true converts to 1
equal(isNumber(false), false); // false converts to 0
equal(isNumber([]), false); // [] converts to 0
equal(isNumber([2]), false); // [] converts to first element, which is 2.
equal(isNumber(null), false); // null converst to 0
});
});
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<h1 id="qunit-header">Testing isNumber using isNaN()</h1>
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