Javascript pipe in math to get Math.floor without using Math.floor

 

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  • Using bitwise OR 0 to floor a number 5 answers

    • A single pipe | is BitWise OR.
    Bitwise operator only allow integer values, so after decimal point value is discarded.

    Bitwise OR operator | takes 2 bit patterns, and perform OR operations on each pair of corresponding bits.
    The following example will explain it. 

    1010                            
1100       
----------bitwise or
1110
  • Firstly the result of (9+2)/2 is 5.5 in JavaScript
  • Then it's applied a bitwise Or operation. For JavaScript, the bitwise operations don't work directly on the 64-bit representations. Instead, the value is converted into a 32-bit integer, which means 5.5 to 5 , then the result of 5|0 is 5 .
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