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javascriptmathnegative-number
TunaFFish
TunaFFish

Reputation: 11302

Javascript Math Object Methods - negatives to zero

in Javascript I can't seem to find a method to set negatives to zero?

-90 becomes 0
-45 becomes 0
0 becomes 0
90 becomes 90

Is there anything like that? I have just rounded numbers.

Upvotes: 120

Views: 80584

Answers (8)

Ruan Mendes
Ruan Mendes

Reputation: 92274

function makeNegativeNumberZero(num) {
  return !!Math.max(0, num);
}

// or 

function makeNegativeNumberZero(num) {
  return num < 0 ? 0 : num;
}

Upvotes: 4

RightSaidFred
RightSaidFred

Reputation: 11327

I suppose you could use Math.max().

var num = 90;
num = Math.max(0,num) || 0; // 90

var num = -90;
num = Math.max(0,num) || 0; // 0

Upvotes: 82

Test
Test

Reputation: 1

var num = 90;
num = Math.max(0,num); // 90

var num = -90;
num =Math.max(0,num); //0

This method can be used

Upvotes: -1

Redu
Redu

Reputation: 26161

Well value = Math.max(0,value) is just neat but after 10 years, i just don't want one other nice method to go unmentioned.

value < 0 && (value = 0);

Upvotes: 0

Killy
Killy

Reputation: 330

Remember the negative zero.

function isNegativeFails(n) {
    return n < 0;
}
function isNegative(n) {
    return ((n = +n) || 1 / n) < 0;
}
isNegativeFails(-0); // false
isNegative(-0); // true
Math.max(-0, 0); // 0
Math.min(-0, 0); // -0

Source: http://cwestblog.com/2014/02/25/javascript-testing-for-negative-zero/

Upvotes: 0

SLaks
SLaks

Reputation: 887365

If you want to be clever:

num = (num + Math.abs(num)) / 2;

However, Math.max or a conditional operator would be much more understandable.
Also, this has precision issues for large numbers.

Upvotes: 8

Alexandre C.
Alexandre C.

Reputation: 56956

x < 0 ? 0 : x does the job .

Upvotes: 3

aioobe
aioobe

Reputation: 420951

Just do something like

value = value < 0 ? 0 : value;

or

if (value < 0) value = 0;

or

value = Math.max(0, value);

Upvotes: 256

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