CODEWITHSUNDEEP
javascriptif-statement
goodguy5
goodguy5

Reputation: 13

Shortening Multiple IF Conditions for the Same Variable

(first stackoverflow post) This is a javaScript question, but I think the logic applies anywhere

I've wondered for a long time about using an if statement to compare multiple values against the same variable without needing to type out the variable every time; specifically, in regards to "greater than" and "less than".

The specific example I'm trying to solve is:

var middle = 5;
if(middle < 10 && middle > 0) {
    //some stuff
}

I'm looking for something like:

var middle = 5;
if(middle (< 10 && > 0)) {
    //the same stuff
}

I have checked is-there-a-way-to-shorten-the-condition-if-it-always-compares-to-the-same-thing and if-statements-matching-multiple-values and if-statement-multiple-conditions-same-statement. I could not derive a simple answer to my specific question from those.

A final note: I do not want to make a new "multiple if" function that accepts arguments and then compares them for the variable. I am looking for a "built-in" way to do this.

Thanks, -Charles

Upvotes: 1

Views: 3653

Answers (5)

Ankit Arora
Ankit Arora

Reputation: 97

If anyone is doing this in python for multiple values you can try this

exclude = ['10','0','20','30','12','14']
if i not in exclude:
   print(i)

Upvotes: 0

hugomg
hugomg

Reputation: 69934

I am looking for a "built-in" way to do this.

Javascript doesn' t support this feature. In fact, most languages don't and Python is the only famous example I can think of right now that does that (you can write 0 < middle < 10 there).

In Javascript, the best you can do is use a shorter variable name

if(0 <= x && x < 10)

Or abstract common tests into a function

if(between(0, x, 10))

Upvotes: 0

Bergi
Bergi

Reputation: 664307

Some languages like Python and Coffeescript (which compiles to JS!) have chained comparisons:

if (0 < middle < 10)

However, Javascript does not have these. Just as you already do, you will need to reference the variable twice:

if (0 < middle && middle < 10)

Upvotes: 4

Theo.T
Theo.T

Reputation: 9257

Right, don't do this, but just for the sake of it :

if (Math.min(10, Math.max(0, middle)) == middle) {
   // middle is between 0 and 10
}

Upvotes: 0

MrHaze
MrHaze

Reputation: 3996

I don't believe it's possible, for a logical operator you need both sides of the operator to evaluate to true or false.

If you are missing a side the statement can't be evaluated.

Upvotes: 1

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