Bitwise Operators & Binary Numbers

    // bitwise.js
    // JavaScript Bitwise operators
    // AND &
    // OR |
    // XOR ^
    // NOT ~
    // Shift left <<
    // Shift right >>
    let log = console.log;
    let n = 10;	// 1010
    let i = 6;	//  110
    log(n.toString(2), i.toString(2));	// returning at base 2
    log( "AND & ", (n & i) );	// returns 0010 (or 2)
    log( "OR | ", (n | i) );	// returns 1110 (or 14)
    log( "XOR ^ ", (n ^ i) );	// returns 1100 (or 12) - XOR = exclusive OR
    // ~ 1010
    //	0101
    // x = - (x+1)
    log( "NOT ~ ", (~n) );	// returns - 11
    
    //PERMISSIONS
    // read, write, delete 
    let perm = 6;
    let allowedToRead = (perm & 4 == 4)? true:false; 
    let allowedToWrite = (perm & 2 == 2)? true:false; 
    let allowedToDelete = (perm & 1 == 1)? true:false;
     
    // ODD or EVEN
    for (var c=0; c<50; c++){ 
        if(c & 1){
            // odd
        } else {
            // even
        }
    }
    
    // SHIFTING TO THE LEFT or RIGHT
    // 101010 >> 4 = 10 (or 2)
    // 111 >> 1 = 11 (or 3)
    log( 7 >> 1);	// returns 3
    
    // 111 << 1 = 1110 (or 14) - shifting 1 to the left is the same as multiplying the number by two.
    
    // HEXADECIMAL COLORS
    // FF3300 - 24 bit values: 8 bits RED, 8 bits GREEN 8 bits BLUE
    // GREEN – Shift 8 >>, AND 11111111 (255)
    // 111111110011001100000000 >> 8 = 1111111100110011
    // 1111111100110011
    // 0000000011111111
    // 00110011
    
    var color = 0xFF3300;	// Hexadecimals in JavaScript start with 0x 
    var noblue = color >> 8;
    var green = noblue & 255;
    log('GREEN', green, green.toString(16))	// returns: GREEN, 51, 33
    
    /************************************* counting in decimal, binary
    0	0	
    1	1	    2^0
    2	10	    2^1
    3	11	
    4	100	    2^2
    5	101	
    6	110	
    7	111	
    8	1000	2^3
    9	1001	
    10	1010	
    11	1011	
     
    12	1100	
    13	1101	
    14	1110	
    15	1111	
    16	11111	2^4
    ************************************/