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 2 | shift right by 1 | someNumber >> 1 |
| multiply by 2 | shift 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 |withspace | '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)
