Repeat

With the Repeat func we can repeat a string. The first argument is the string we want to repeat, and the second is the count of repetitions.

This method can be useful when we need to do benchmarks on a large string. We could just call strings.Repeat instead of building up a string directly.

Example

For creating repeating text, using Repeat() with a string literal is a good solution. Here we repeat a string literal with the letters "abc" 3 times.

package main

import (
    "fmt"
    "strings"
)

func main() {
    // Create a new string based on a repetition.
    result := strings.Repeat("abc...", 3)
    fmt.Println(result)
}
abc...abc...abc...

Repeat panic

The second argument to strings.Repeat() is the count of repetitions we want in the resulting string. Having a negative number makes no sense, so this leads to a panic.

package main

import (
    "strings"
)

func main() {
    value := "a"
    // Cannot repeat negative amount.
    strings.Repeat(value, -1)
}
panic: strings: negative Repeat count

goroutine 1 [running]:
...
exit status 2

Though it is rarely needed, strings.Repeat can be useful in certain programs where we want large strings to test our programs. It can avoid the need writing a messy loop where we concat repeatedly.