javascript check for undefined
if (typeof myVariable === 'undefined'){
//myVariable is undefined
}javascript check for undefined
if (typeof myVariable === 'undefined'){
//myVariable is undefined
}javascript if undefined
if(typeof comment === 'undefined') {
alert('Variable "comment" is undefined.');
} else if(comment === null){
alert('Variable "comment" is null.');
}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); //12undefined javascript check
if(undefinedElement === null) {
console.log("Element is undefined");
}Copyright © 2021 Codeinu
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