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.');
}test if is undefined javascript
let id;
if(typeof id === 'undefined') {
console.log("id is undefined...");
}test undefined js
if (t === undefined) {
return 'Undefined value!';
}javascript check if boolean is undefined
if (typeof myFlag !== "undefined") {
// comes here whether myFlag is true or false but not defined
}js check if undefined
let foo = undefined
//will return true
typeof foo === 'undefined'Copyright © 2021 Codeinu
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