What does the operator |= do in JavaScript?

Question

I found the following code in a JS project:

var a = new Array();
a[0] = 0;
for (var b = 0; b < 10; b++) {
  a[0] |= b; 
}

What does the

Answer 1

Returns a one in each bit position for which the corresponding bits of either or both operands are ones.

Code: result = a | b;

^ is the bitwise XOR operator, which returns a one for each position where one (not both) of the corresponding bits of its operands is a one. The next example returns 4 (0100):