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javascriptbit-manipulationbitwise-operators
jMike
jMike

Reputation: 312

JavaScript and bitwise operators

Why is in JavaScript:

console.log('1000' | '1010'); // 1018 not '1010'?

and

console.log('1000' & '1010'); // 992 not '1000'?

What ist the right way for bitwise calculation in JavaScript?

Upvotes: 2

Views: 710

Answers (3)

Sufian Saory
Sufian Saory

Reputation: 892

input numbers need to be defined in binary. after operation you need to convert the result to binary again since bitwise operation produces decimal number. following code will produce your desired output.

console.log(('0b1000' | '0b1010').toString(2));
console.log(('0b1000' & '0b1010').toString(2));

Upvotes: 3

SilentLupin
SilentLupin

Reputation: 658

it's using the binary equivalent of the decimal numbers you put in. You are actually getting 

0000001111101000 | 0000001111110010
0000001111101000 & 0000001111110010

which are equivalent to 1018 and 992 in decimal

Upvotes: 4

chenchuk
chenchuk

Reputation: 5742

You have to define the input as binary number :

console.log(0b1000 | 0b1010); 
> 10

Then you can convert back the decimal number to binary notation:

Number(10).toString(2);
> "1010"

Upvotes: 4

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