js is undefined or null
var myVar=null;
if(myVar === null){
//I am null;
}
if (typeof myVar === 'undefined'){
//myVar is undefined
}js is undefined or null
var myVar=null;
if(myVar === null){
//I am null;
}
if (typeof myVar === 'undefined'){
//myVar is undefined
}javascript null vs undefined
/* In Javascript,
* null: a value explicitly set by the programmer for the intentional lack of value.
* undefined: a value implictily or explicitly set for the intentional lack of value.
*/
console.log(null == undefined) // true
console.log(null === undefined) // false
let a = null
console.log(a) // null
let c;
let d = undefined;
console.log(c, d) // undefined undefined
console.log(typeof null) // Object
console.log(typeof undefined) // undefinednull undefined javascript
Undefined used for unintentionally missing values.
Null used for intentionally missing values.Copyright © 2021 Codeinu
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