CODEWITHSUNDEEP
go
fyhuang
fyhuang

Reputation: 2187

How to copy array into part of another in Go?

I am new to Go, and would like to copy an array (slice) into part of another. For example, I have a largeArray [1000]byte or something and a smallArray [10]byte and I want the first 10 bytes of largeArray to be equal to the contents of smallArray. I have tried:

largeArray[0:10] = smallArray[:]

But that doesn't seem to work. Is there a built-in memcpy-like function, or will I just have to write one myself?

Thanks!

Upvotes: 20

Views: 27090

Answers (1)

peterSO
peterSO

Reputation: 166569

Use the copy built-in function.

package main

func main() {
    largeArray := make([]byte, 1000)
    smallArray := make([]byte, 10)
    copy(largeArray[0:10], smallArray[:])
}

Upvotes: 41

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