Topic Name : Hidden Use of eval

setTimeout and setInterval can also take a string as their first parameter. 

```javascript

function foo() {
    // will get called
}

function bar() {
    function foo() {
        // never gets called
    }
    setTimeout('foo()', 1000);
}
bar();

```
In node v7.3.0
Here  `setTimeout('foo()', 1000);` will throw TypeError: "callback" argument must be a function
