How to swap two variable value without using temporary variable

Maybe you will find coding skill test that push you ability to swap value between two variables, some developer often using "the third var" technique

// use var instead of let :( var a = 10; var b = 14; var temp = b; b = a a = temp console.log(a, b); 

but some developer don't waste his line to create third variable, so this is what they do

let a = 10; let b = 15; [a,b] = [b,a]; // array destructuring console.log(a, b); 

even more, they can shorting their line with this rhapsodic technique

let [a,b] = [10,15]; [a,b] = [b,a]; console.log(a, b);