Must you define a data type when declaring a variable in JavaScript? [duplicate]

Question

Must you define a data type when declaring a variable in JavaScript?

No, you can define variables in javascript like var myVariable — kalenpw
– kalenpw, Commented Feb 26, 2017 at 4:25
to say "you can" suggests there's another option - there isn't ... variables are untyped — Jaromanda X
– Jaromanda X, Commented Feb 26, 2017 at 4:31
@jaromandaX Good point, you MUST declare variables with the var keyword, but is now too late to edit my comment — kalenpw
– kalenpw, Commented Feb 26, 2017 at 4:33
of course, there's var, let and const now :p and not using any of those is equivalent to window.xxx (in a browser) — Jaromanda X
– Jaromanda X, Commented Feb 26, 2017 at 4:34

Terminus · Accepted Answer · 2017-02-26 04:25:30Z

0

No, you ca go with just

var x = 5;

The interpreter would guess what type the var is.

answered Feb 26, 2017 at 4:25

Terminus

94712 silver badges26 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

sbartell · Accepted Answer · 2017-02-26 04:26:57Z

0

No. Javascript is not strongly typed.

answered Feb 26, 2017 at 4:26

sbartell

8731 gold badge7 silver badges19 bronze badges

kalenpw · Accepted Answer · 2017-02-26 04:27:26Z

0

No, in Javascript variables are defined by simply using the var keyword followed by your variable name.

Example

var intVariable = 3;

var stringVariable = "Dog";

You can read more about javascript variables here

answered Feb 26, 2017 at 4:27

kalenpw

6953 gold badges11 silver badges34 bronze badges