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.');
}how to check if object is undefined in javascript
if (typeof something === "undefined") {
alert("something is undefined");
}test if is undefined javascript
let id;
if(typeof id === 'undefined') {
console.log("id is undefined...");
}javascript check if null
if (variable === null) { //Executes only if variable is null but not undefined
//Code here
}
if (variable == null) { //Executes if variable is null OR undefined
//Code here
}js check if undefined
let foo = undefined
//will return true
typeof foo === 'undefined'Copyright © 2021 Codeinu
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