javascript check if undefined null or empty code example
Example 1: javascript check if undefined or null
if( typeof myVar === 'undefined' || myVar === null ){
// myVar is undefined or null
}
Example 2: javascript check if empty
//check if string is undefined
if (typeof myVar === 'undefined'){
console.log("I am not defined");
}
//check if string is empty, null, or 0
var emptyString="";
if (emptyString) {
console.log("im not empty");
}