Slices in Go

Go's growable views over arrays.

func sliceBasics() ([]int, int) {
    nums := []int{3, 1, 4, 1, 5}
    nums = append(nums, 9)

    middle := nums[1:4]
    copied := make([]int, len(nums))
    copy(copied, nums)

    total := 0
    for _, n := range nums {
        total += n
    }
    return middle, total
}

How it works

1. append grows a slice, returning the new one.
2. nums[1:4] slices without copying.
3. make and copy create an independent copy.

Keywords and builtins used here

• append
• copy
• for
• func
• int
• len
• make
• range
• return

The run, in numbers

Lines

14

Characters to type

231

Tokens

83

Three-star pace

90 tpm

At the three-star pace of 90 tokens a minute, this run takes about 55 seconds.

Type this snippet

Step 2 of 9 in Arrays, slices & maps, step 17 of 30 in Language basics.

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Slices in other languages

• Rust