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break、continue 与带标签的循环

使用标签精确控制循环。

break、continue 与带标签的循环 是 CoddyKit 上的免费 Zig Academy 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Zig Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Zig Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Two Loop Controls

Inside any loop, break exits the loop entirely while continue jumps to the next iteration. They give you fine control over flow. 🎛️

break Leaves Now

When break runs, the loop stops immediately and execution resumes on the line right after the loop. Nothing else in the body runs.

for (items) |x| {
    if (x == 0) break;
    use(x);
}

continue Skips Ahead

A continue abandons the rest of the current pass and moves on to the next iteration, leaving the loop itself running.

for (items) |x| {
    if (x < 0) continue;
    total += x;
}

They Target the Innermost Loop

By default break and continue affect only the innermost loop around them. An outer loop keeps running as if nothing happened.

Naming a Loop

You can attach a label to a loop with a name and a colon. That label gives you a handle to target it from deeper inside.

outer: for (rows) |row| {
    for (row) |cell| {
        check(cell);
    }
}

break to a Label

Write break :outer to exit a named outer loop directly from within a nested loop. One statement unwinds both levels.

outer: for (rows) |row| {
    for (row) |cell| {
        if (cell == target) break :outer;
    }
}

continue to a Label

Use continue :outer to skip to the next iteration of a labeled outer loop, abandoning the rest of the inner loop instantly.

Labels Replace Flags

Before labels you might set a found flag and check it after each loop. Labeled break removes that boilerplate and reads more clearly.

Labeled break Returns a Value

A labeled loop can also be an expression. break :outer value hands that value back as the result of the whole labeled loop.

const hit = outer: for (rows) |row| {
    for (row) |c| {
        if (c == target) break :outer c;
    }
} else 0;

Labeled Blocks Too

Labels are not just for loops. A plain block can be labeled, and break with a value turns that block into an expression.

const x = blk: {
    const t = compute();
    break :blk t * 2;
};

Keep Nesting Shallow

Labeled control is powerful, but deeply nested loops hurt readability. Reach for labels when they clarify, not to excuse tangled code.

Quick Check

From an inner loop you want to exit the outer loop named outer. Which statement does it?

Recap

You mastered break and continue: innermost by default, labeled loops for nesting, value-returning labeled breaks, and labeled blocks. 🎯

常见问题解答

「break、continue 与带标签的循环」课时是免费的吗？

是的 — 「break、continue 与带标签的循环」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Zig Academy 课程的其余内容，请升级到 CoddyKit PRO。 Zig Academy 课程共包含 4 节课。

「break、continue 与带标签的循环」这节课中我会学到什么？

使用标签精确控制循环。你通过在浏览器中直接运行的动手代码来练习 Zig Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Zig Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Zig Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「break、continue 与带标签的循环」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Zig Academy 课中编写并运行代码吗？

能。每节 Zig Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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