Leveraging anonymous functions within an IF statement in JavaScript

Can you explain how to implement an anonymous function within an if statement? Feel free to use the provided example. Thank you

if(function(){return false;} || false) {alert('true');}

For more information, visit https://jsfiddle.net/san22xhp/

Answer №1

To execute the function immediately, wrap it in parentheses and call it like this:

if((function(){return false;})() || false) {alert('true');}

Example: https://jsfiddle.net/Ar14/7p2ompod/

Answer №2

Utilize the .call() method provided by the function constructor:

if(function(){return false;}.call() || false) { alert('true'); }

An added benefit of using this approach is the ability to pass variables to the function, for example:

if(function(){return arguments[0] == 7;}.call(null, 7) === true) alert('yes, it is 7');

Check out this JSFiddle link for a live demo.

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