用整数乘法重复字符串 [英] Repeat string with integer multiplication

问题描述

是否有一种简单的方法可以在 Rust 中执行以下操作(来自 Python)?

Is there an easy way to do the following (from Python) in Rust?

<代码>>>>打印(重复"* 4)重复重复重复重复

我开始学习这门语言，似乎 String 并没有覆盖 Mul，而且我在任何地方都找不到任何关于紧凑方式的讨论这样做(除了地图或循环).

I'm starting to learn the language, and it seems String doesn't override Mul, and I can't find any discussion anywhere on a compact way of doing this (other than a map or loop).

推荐答案

Rust 1.16+

str::repeat 现在可用:

fn main() {
    let repeated = "Repeat".repeat(4);
    println!("{}", repeated);
}

Rust 1.0+

您可以使用 iter::repeat:

use std::iter;

fn main() {
    let repeated: String = iter::repeat("Repeat").take(4).collect();
    println!("{}", repeated);
}

这也有一个更通用的好处——它创建了一个无限重复的任何类型的可克隆迭代器.

This also has the benefit of being more generic — it creates an infinitely repeating iterator of any type that is cloneable.

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