check undefined javascriot code example
Example 1: js if not undefined
if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}Example 2: js check if undefined
let foo = undefined
//will return true
typeof foo === 'undefined'if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}let foo = undefined
//will return true
typeof foo === 'undefined'