ennvlxkm
10 days ago  Karma: 273
Negative zero in JavaScript

Does anyone know why does JavaScript support both normal zero and negative zero?

en
#javascript
ennvlxkm
10 days ago  Karma: 273
Negative zero in JavaScript

Does anyone know why does JavaScript support both normal zero and negative zero?

en
#javascript

2 ANSWERS
clam0
10 days ago Karma: 2602

int x = -0
int y = +0

x === y evaluates to true , so javascript treats them as the same number.

" In the IEEE 754 standard used to represent the Number type in JavaScript, the sign is represented by a bit (a 1 indicates a negative number).

As a result, there exists both a negative and a positive value for each representable number, including 0.

This is why both -0 and +0 exist."

int x = -0
int y = +0

x === y evaluates to true , so javascript treats them as the same number.

" In the IEEE 754 standard used to represent the Number type in JavaScript, the sign is represented by a bit (a 1 indicates a negative number).

As a result, there exists both a negative and a positive value for each representable number, including 0.

This is why both -0 and +0 exist."

kayden.hughes
10 days ago Karma: 1057

It can be used in several scenarios to prevent unwanted information loss.
Like the speed of movement per animation frame where the sign could represent the direction of the movement. If the sign is lost, you will have no way of knowing what direction it was moving in before getting at zero.

It can be used in several scenarios to prevent unwanted information loss.
Like the speed of movement per animation frame where the sign could represent the direction of the movement. If the sign is lost, you will have no way of knowing what direction it was moving in before getting at zero.

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