javascript how to check undefined code example
Example 1: js if not undefined
if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}
Example 2: javascript check for undefined
if (typeof myVariable === 'undefined'){
}
Example 3: test if is undefined javascript
let id;
if(typeof id === 'undefined') {
console.log("id is undefined...");
}
Example 4: js check if undefined
let foo = undefined
typeof foo === 'undefined'
Example 5: javascript check undefined
if(myVar === null) {
console.log("Element is undefined");
}