Go - For Loop

Forms

for i := 0; i < 3; i++ { fmt.Println(i) }

for i < 10 { i++ } // while-like

for i, v := range []string{"a","b"} { fmt.Println(i, v) }

Common errors

• Mutating a slice while iterating over it with range—collect changes first.
• Forgetting to update the loop variable in while-like forms.

Practice

• Sum only the even numbers in a slice of ints using range.

Quick quiz

1. What are the three forms of for in Go?