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在 Mojo REPL 中探索

交互式尝试表达式

在 Mojo REPL 中探索 是 CoddyKit 上的免费 Mojo 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 Mojo Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Mojo 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。

A Playground for Code

Sometimes you just want to try a line quickly. The REPL lets you type Mojo and see results instantly, no file needed. 🎮

What REPL Stands For

REPL means Read, Evaluate, Print, Loop. It reads your line, runs it, prints the result, then waits for the next line.

Start the REPL

Open it by typing mojo with no file name in your terminal. A prompt appears, ready for you to enter expressions.

mojo

Type an Expression

At the prompt, type something simple like a sum. The REPL evaluates it and shows the answer right away.

1 + 2

Print in the REPL

You can call print just like in a file. The text shows up immediately under the line you typed.

print("Hello from the REPL")

Make a Variable

Declare a value with var and the REPL remembers it. You can reuse that variable in your next lines.

var x = 10

State Sticks Around

Each line builds on the last, so variables you defined stay available until you quit. This makes quick experiments easy.

var y = x * 2

Test Ideas Fast

The REPL is perfect for checking how a function or expression behaves before you commit it to a real file.

No main Required

Unlike a file, the REPL needs no main function. You type statements directly and they run as soon as you enter them.

Leaving the REPL

When you are done, type :quit or press Ctrl-D to exit back to your normal terminal. Your session variables are then cleared.

:quit

REPL vs Files

Use the REPL for quick tries and learning; use files for real programs you save, run again, and share. Both have their place.

Quick Check

You want to test a one-line expression without creating a file. What tool fits best?

Recap

The REPL runs Mojo line by line, keeps your variables during the session, needs no main, and is ideal for fast experiments. 🎯

常见问题解答

「在 Mojo REPL 中探索」课时是免费的吗？

是的 — 「在 Mojo REPL 中探索」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 Mojo Academy 课程的其余内容，请升级到 CoddyKit PRO。 Mojo Academy 课程共包含 4 节课。

「在 Mojo REPL 中探索」这节课中我会学到什么？

交互式尝试表达式你通过在浏览器中直接运行的动手代码来练习 Mojo 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 Mojo Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Mojo 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。

「在 Mojo REPL 中探索」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 Mojo Academy 课中编写并运行代码吗？

能。每节 Mojo 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。

此课程中的所有课时

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