javascript check if not undefined
if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}javascript check if not undefined
if (typeof myVar !== "undefined") {
console.log("myVar is DEFINED");
}javascript check if undefined or null
if( typeof myVar === 'undefined' || myVar === null ){
// myVar is undefined or null
}javascript syntax for check null or undefined or empty
if (typeof value !== 'undefined' && value) {
//deal with value'
};javascript check if undefined or null or empty string
// simple check do the job
if (myString) {
// comes here either myString is not null,
// or myString is not undefined,
// or myString is not '' (empty).
}Copyright © 2021 Codeinu
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