CODEWITHSUNDEEP
javascriptnull
Kab
Kab

Reputation: 1

How to create an if statement that checks the values variables are all non-null?

I am currently new to javascript and running through some of my textbooks coding projects and the current problem asks to create an if statement that checks the values of the elements referenced by the name fname, lname, and zip are all non-null.

This is the code I have so far for the script 

var newAccountArray = [];

function createID() {
var fname = fnameinput;
var lname = lnameinput;
var zip = zipinput;
var account = accountidbox
var fields = input;
var acctid;
var firstInit;
var lastInit;

if ( !== null)



}

I was wondering if I had to do something different for multiple variables

use if (myVar) or if (myVar !== null)

Upvotes: 0

Views: 324

Answers (2)

Fyllekanin
Fyllekanin

Reputation: 274

As mentioned by Rohitas Behera in the comments if(variable) is enough.

if(variable) will not pass when variable is either of the following: * null * undefined * false (boolean value). * empty string

One common problem with using if(variable) is that you still want the if statement to pass if the variable is an empty string as it's some times a legit case. In these cases you can do.

if(variable || variable === '')

Upvotes: 0

Gautam
Gautam

Reputation: 825

You can do something like 

if(fname && lname && zip){
   // your code
}

This will check for if fname, lname and zip are not (null, undefined, "", false, 0, NaN)

Upvotes: 1

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