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Why does 0.-5 evaluate to -5?

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10

2

Suppose I write 0.5 as 0.-5 in unexpected way, but it can still run. What does 0. in 0.-5 do so that it can still run and evaluates to -5?

I also tried alert(0.-5+1) which prints -4, does JavaScript ignore 0. in 0.-5?

javascript numbers

share|improve this question

edited 14 mins ago

Community♦

11

asked 6 hours ago

mmmaaammmaaa

2,2431312

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  0. is like 0.0. Or just 0.
  
  – Ry-♦
  6 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What makes you think that 0.-5 is an "unexpected way"?
  
  – Nico Haase
  34 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicoHaase: I'm pretty sure the OP used "unexpected way" to mean "I did not intend/expect to write that, but somehow I did".
  
  – Filip Milovanović
  7 mins ago
  

  
  
  
  

add a comment | 

10

2

Suppose I write 0.5 as 0.-5 in unexpected way, but it can still run. What does 0. in 0.-5 do so that it can still run and evaluates to -5?

I also tried alert(0.-5+1) which prints -4, does JavaScript ignore 0. in 0.-5?

javascript numbers

share|improve this question

edited 14 mins ago

Community♦

11

asked 6 hours ago

mmmaaammmaaa

2,2431312

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  0. is like 0.0. Or just 0.
  
  – Ry-♦
  6 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What makes you think that 0.-5 is an "unexpected way"?
  
  – Nico Haase
  34 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicoHaase: I'm pretty sure the OP used "unexpected way" to mean "I did not intend/expect to write that, but somehow I did".
  
  – Filip Milovanović
  7 mins ago
  

  
  
  
  

add a comment | 

Suppose I write 0.5 as 0.-5 in unexpected way, but it can still run. What does 0. in 0.-5 do so that it can still run and evaluates to -5?

I also tried alert(0.-5+1) which prints -4, does JavaScript ignore 0. in 0.-5?

javascript numbers

share|improve this question

edited 14 mins ago

Community♦

11

asked 6 hours ago

mmmaaammmaaa

2,2431312

share|improve this question

edited 14 mins ago

Community♦

11

asked 6 hours ago

mmmaaammmaaa

2,2431312

share|improve this question

edited 14 mins ago

Community♦

11

asked 6 hours ago

mmmaaammmaaa

2,2431312

edited 14 mins ago

Community♦

11

edited 14 mins ago

Community♦

11

asked 6 hours ago

mmmaaammmaaa

2,2431312

asked 6 hours ago

mmmaaammmaaa

2,2431312

2 Answers
2

active

oldest

votes

18

Trailing digits after a . are optional:

console.log(0. === 0);

So

0.-5

evalutes to

0 - 5

which is just -5. Similarly,

0.-5+1

is

0 - 5 + 1

which is

-5 + 1

or -4.

share|improve this answer

answered 6 hours ago

CertainPerformanceCertainPerformance

88.9k154877

add a comment | 

2

In JS you can express a number with optional decimal point.

x = 5.;    //5

x = 5. + 6.   //11

And as of Tvde1's comment, any Number methods can be applied too.

5..toString()

share|improve this answer

edited 42 mins ago

answered 5 hours ago

Charlie HCharlie H

9,05342550

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can even do 5..toString().
  
  – Tvde1
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If fact, you have to do 5..toString() to call the method, otherwise, you have to use parenthesis: (5).toString()
  
  – jo_va
  12 mins ago
  

  
  
  
  

add a comment | 

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18

Trailing digits after a . are optional:

console.log(0. === 0);

So

0.-5

evalutes to

0 - 5

which is just -5. Similarly,

0.-5+1

is

0 - 5 + 1

which is

-5 + 1

or -4.

share|improve this answer

answered 6 hours ago

CertainPerformanceCertainPerformance

88.9k154877

add a comment | 

18

Trailing digits after a . are optional:

console.log(0. === 0);

So

0.-5

evalutes to

0 - 5

which is just -5. Similarly,

0.-5+1

is

0 - 5 + 1

which is

-5 + 1

or -4.

share|improve this answer

answered 6 hours ago

CertainPerformanceCertainPerformance

88.9k154877

add a comment | 

Trailing digits after a . are optional:

console.log(0. === 0);

So

0.-5

evalutes to

0 - 5

which is just -5. Similarly,

0.-5+1

is

0 - 5 + 1

which is

-5 + 1

or -4.

share|improve this answer

answered 6 hours ago

CertainPerformanceCertainPerformance

88.9k154877

console.log(0. === 0);

0.-5

0 - 5

0.-5+1

0 - 5 + 1

-5 + 1

console.log(0. === 0);

console.log(0. === 0);

share|improve this answer

answered 6 hours ago

CertainPerformanceCertainPerformance

88.9k154877

answered 6 hours ago

CertainPerformanceCertainPerformance

88.9k154877

answered 6 hours ago

CertainPerformanceCertainPerformance

88.9k154877

2

In JS you can express a number with optional decimal point.

x = 5.;    //5

x = 5. + 6.   //11

And as of Tvde1's comment, any Number methods can be applied too.

5..toString()

share|improve this answer

edited 42 mins ago

answered 5 hours ago

Charlie HCharlie H

9,05342550

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can even do 5..toString().
  
  – Tvde1
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If fact, you have to do 5..toString() to call the method, otherwise, you have to use parenthesis: (5).toString()
  
  – jo_va
  12 mins ago
  

  
  
  
  

add a comment | 

2

In JS you can express a number with optional decimal point.

x = 5.;    //5

x = 5. + 6.   //11

And as of Tvde1's comment, any Number methods can be applied too.

5..toString()

share|improve this answer

edited 42 mins ago

answered 5 hours ago

Charlie HCharlie H

9,05342550

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can even do 5..toString().
  
  – Tvde1
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If fact, you have to do 5..toString() to call the method, otherwise, you have to use parenthesis: (5).toString()
  
  – jo_va
  12 mins ago
  

  
  
  
  

add a comment | 

In JS you can express a number with optional decimal point.

x = 5.;    //5

x = 5. + 6.   //11

And as of Tvde1's comment, any Number methods can be applied too.

5..toString()

share|improve this answer

edited 42 mins ago

answered 5 hours ago

Charlie HCharlie H

9,05342550

x = 5.;    //5

x = 5. + 6.   //11

5..toString()

share|improve this answer

edited 42 mins ago

answered 5 hours ago

Charlie HCharlie H

9,05342550

answered 5 hours ago

Charlie HCharlie H

9,05342550

answered 5 hours ago

Charlie HCharlie H

9,05342550