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I am new to java-script and not able to understand the use of | operator in following code snippet

<!DOCTYPE html> <html> <body> <p>Click the button to display a number between 0 and 1</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var a=Math.random(); var x = ((a*2 | 0)); document.getElementById("demo").innerHTML = x; } </script> </body> </html>

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That's bitwise OR operator

Performs the OR operation on each pair of bits. a OR b yields 1 if either a or b is 1. The truth table for the OR operation is:

Bitwise ORing any number x with 0 yields x. Bitwise ORing any number x with -1 yields -1.

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