Unfamiliar characters used in JavaScript encryption script

Question

Here is an excerpt from a JS encryption script that I am studying.

function permutationGenerator(nNumElements) {
    this.nNumElements     = nNumElements;
           


        

Answer 1

| = bitwise or

1010
0100
----
1110

& = bitwise and

1011
0110
----
0010

so it's the same as && and || just with the single bits

<< is left shift, so

0110 << 2 shifts the numbers left by two positions, yielding 011000 another way to think of this is multiplication by two, so x<<1 == x*2, x<<2 == x*2*2 and so on, so it's x * Math.pow(2,n) for x<

>> 

is the opposite, so 0110 >> 2 ---> 0001 you can think of it as division by two, BUT with rounding down, so it equals

Math.floor(x/Math.pow(2,n))