javascript check if undefined and not empty code example
Example 1: javascript syntax for check null or undefined or empty
if (typeof value !== 'undefined' && value) {
//deal with value'
};
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");
}