使用 array[start..end] 进行切片
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使用 array[start..end] 进行切片 是 CoddyKit 上的免费 Zig Academy 课时。 这是第 3 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。
Carving Out a View
Sometimes you want only part of an array. Slicing lets you grab a sub-range as a new slice without copying any elements. ✂️
The Range Syntax
Write the start and end inside brackets joined by two dots: array[start..end]. This produces a slice over those positions.
const part = data[1..3];End Is Exclusive
The end index is exclusive, so array[1..3] includes positions 1 and 2 but stops before 3. The result has a length of 2.
Slice to the End
Leave the end off to run all the way to the last element. data[2..] means everything from index 2 onward.
const tail = data[2..];Slice the Whole Thing
Using [0..] turns an entire array into a slice. It is the common way to hand a full array to slice-taking code.
const all = data[0..];No Copy Happens
Slicing only computes a new pointer and length. The elements stay shared with the original array, so it is fast and allocation-free.
Slicing a Slice
You can slice a slice just like an array. The new range is relative to the slice's own start, narrowing the view further.
const inner = part[0..1];Out-of-Range Is Caught
If start or end falls outside the data, safe builds panic at runtime. This stops you from reading memory you never owned.
Compile-Time Slices
When the bounds are known at compile time, the result can be a pointer to an array with a fixed length baked into its type.
Sentinel-Terminated Slices
Add a terminator with [start..end :0] to guarantee a trailing zero. This is handy when passing strings to C code.
const cstr = buf[0..n :0];Length from the Range
A slice's length is simply end minus start. So data[2..5] always yields a slice whose len is exactly 3.
const three = data[2..5]; // len == 3Quick Check
You have const data = [_]i32{ 0, 1, 2, 3, 4 }. What is the length of data[1..4]?
Recap
The array[start..end] syntax carves a sub-view: end is exclusive, omit it for the tail, nothing is copied, and bounds stay checked. 🎯
常见问题解答
「使用 array[start..end] 进行切片」课时是免费的吗？
是的 — 「使用 array[start..end] 进行切片」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。
「使用 array[start..end] 进行切片」这节课中我会学到什么？
无需复制即可创建子视图。 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 3 节课，共 4 节。
「使用 array[start..end] 进行切片」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。