checking if var is not defined js
if(typeof x !== 'undefined'){
alert("Variable x is defined.");
}checking if var is not defined js
if(typeof x !== 'undefined'){
alert("Variable x is defined.");
}assign this value or if it is undefined this other value javascript
var x; //variable to change
var y; //higher priority variable
var z = 12; //lower priority variable
x = !(y === undefined) ? y : z;
console.log(x); //12Copyright © 2021 Codeinu
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