JAVASCRIPT

javascript syntax for check null or undefined or empty

if (typeof value !== 'undefined' && value) {
    //deal with value'
};

js if string not empty

if (!str.length) { ...

Check for a Null or Empty String in JavaScript

let myStr = null;

if (myStr === null || myStr.trim() === "") {
  console.log("This is an empty string!");
} else {
  console.log("This is not an empty string!");
}

javascript check if variable is empty

if( value ) {
  //
}

/**
* This will evaluate to true if value is not:
* null
* undefined
* NaN
* empty string ("")
* 0
* false
*/

javascript validate if string null undefined empty

/**
  * Checks the string if undefined, null, not typeof string, empty or space(s)
  * @param {any} str string to be evaluated
  * @returns {boolean} the evaluated result
*/
function isStringNullOrWhiteSpace(str) {
    return str === undefined || str === null
                             || typeof str !== 'string'
                             || str.match(/^ *$/) !== null;
}

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).
}

javascript check if Empty string, undefined, null

Use for Empty string, undefined, null, ...
//To check for a truthy value:

if (strValue) {
    // strValue was non-empty string, true, 42, Infinity, [], ...
}

//To check for a falsy value:
if (!strValue) {
    // strValue was empty string, false, 0, null, undefined, ...
}

javascript check if string is empty

var string = "not empty";
if(string == ""){
  console.log("Please Add");
}
else{
  console.log("You can pass"); // console will log this msg because our string is not empty
}