What is "?" combined with " :" in javascript?

Question

Hi I really don't understand what's the "?" combined with ":" in a same sentence

Example :

 var c = myFunction(); 
var b = c + 3; 
var a = b ? c : 1; 

console.log(a); 

function myFunction() {

return 3; 

};

In a real code what does it mean ?

Answer 1

It's a ternary operator, shorthand for an if/else statement.

This:

var a = b ? c : 1; 

Is essentially:

var a;
if(b){
    a = c;
} else { 
    a = 1;
}