ennvlxkm
about 1 year ago  Karma: 761
Negative zero in JavaScript

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

en
#javascript
ennvlxkm
about 1 year ago  Karma: 761
Negative zero in JavaScript

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

en
#javascript

2 ANSWERS
clam0
about 1 year ago Karma: 3873

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
about 1 year ago Karma: 1622

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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