Binary Operator Hack and Tricks

# Binary Operator Hack and Tricks

August 30, 2020 Name
Moch Lutfi
@kaptenupi

Binary operator is a way to manipulate binary data. We already know there are `&`, `|`, `^`, `<<` and `>>` operators, but not all of us know the secret of each operators. Let's explore what tricks behind those operator using go language.

## Multiply or Divide By 2

We already know how multiply 2 using `* 2` or divide using `/ 2`, but how we can achieve same with binary operator?

divide by 2shift right by 1`someNumber >> 1`
multiply by 2shift left by 1`someNumber << 1`
` // multiply by 2 fmt.Println(4 << 1) // Output: 8 // divide by 2 fmt.Println(4 >> 1) // Output: 2`

## Change case of character

| | | | | ------------------- | ------------------------- | ------------ | ---- | ---- | | change to uppercase | use `&` with `underscore` | `'c' & '_'` | | change to lowercase | use ` |`with`space` | `'A' | ' '` |

` // to upper case char fmt.Println((string)('c' & '_')) // Output: C // to lower case char fmt.Println(string('A' | ' ')) // Output: a`

## Invert case of character

Invert char can be achieved by `xor` with space

` fmt.Println(string('A' ^ ' '), string('b' ^ ' ')) // Output: a B`

## Get letter position

Get letter's position in alphabet (1-26) using `and with 31`

` fmt.Println('z' & 31) // Output: 26`

## Check number odd or even

Simple check if number is odd/even using `and with 1`, odd number will return true

` // odd number return true fmt.Println(7 & 1 > 0) // Output: true // even number return false fmt.Println(8 & 1 > 0) // Output: false`

Try it yourself at https://play.golang.org/p/-wsIlDgBTmF (opens in a new tab)