check if something is null javascript code example

Example 1: javascript is not null

if(data !== null && data !== '') {
   // do something
}

Example 2: javascript check if null

if (variable === null) { //Executes only if variable is null but not undefined
  //Code here
}

if (variable == null) { //Executes if variable is null OR undefined
  //Code here
}

Example 3: javascript check for null variables

var myVar=null;

if(myVar === null){
    //I am null;
}

if (typeof myVar === 'undefined'){
    //myVar is undefined
}

Example 4: js check null

if (Var === null) { 
//code goes here
}

Example 5: javascript null check

if (Var === null) { 
//code goes here
}

Example 6: javascript check if undefined or null

// simple check do the job
if (myVar) {
 // comes here either myVar is not null,
 // or myVar is not undefined,
 // or myVar is not '' (empty string).
}