GoLang-make-it-simple.md

GoLang - Make it simple

1. Multiple independent assignments in one line.

Before

func SumProductDiff(i, j int)(s int, p int, d int) {
    s = i+j
    p = i*j
    d = i-j 
    return
}

After

func SumProductDiff(i, j int)(s int, p int, d int) {
    s, p, d = i+j, i*j, i-j
    return
}

2. Multiple input/return parameters with the same type.

Before

func SumProductDiff(i int, j int)(s int, p int, d int) {
    s, p, d = i+j, i*j, i-j
    return
}

After

func SumProductDiff(i, j int)(s, p, d int) {
    s, p, d = i+j, i*j, i-j
    return
}

3. Force using of the factory of structs instead of new()

package matrix
type matrix struct {
  ...
}
function NewMatrix(params) *matrix {
  m := new(matrix)
  // m is initialized

  return m
}

Because of the lower case m of matrix, we need to use the factory method in another package.

package main
import "matrix"
...
wrong := new(matrix.matrix) // will NOT compile (the struct matrix can't be used directly)
right := matrix.NewMatrix(...) // the ONLY way to instantiate a matrix