javascript check for undefined
if (typeof myVariable === 'undefined'){
//myVariable is undefined
}javascript check for undefined
if (typeof myVariable === 'undefined'){
//myVariable is undefined
}javascript typeof undfined
var x;
if (typeof x === 'undefined') {
// these statements execute
}javascript if undefined
if(typeof comment === 'undefined') {
alert('Variable "comment" is undefined.');
} else if(comment === null){
alert('Variable "comment" is null.');
}how to check if object is undefined in javascript
if (typeof something === "undefined") {
alert("something is undefined");
}javascript check if boolean is undefined
if (typeof myFlag !== "undefined") {
// comes here whether myFlag is true or false but not defined
}check undefined in javascript
if (typeof myVariable === 'undefined'){
//myVariable is undefined
}Copyright © 2021 Codeinu
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