JavaScript OR (||) variable assignment explanation

Question

Can anyone help me with the || operator in JavaScript? I have following the below code:

var a;

var b = null;

var c = undefined;

var d = 4;

var e = 'five';

var f = a || b || c || d || e;

alert(f); // 4

Any help would be appreciated.

Answer 1

Basically, JavaScript use short-circuit evaluation technique for logical operators like && and ||. But, it returns the last value which will halt the execution.

I hope this will help.

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