Hello, Swift

This is Swift · introductory, lesson 1: Hello, Swift. Read the teaching and the stills before the checks. The quizzes are open book and test the subject — Swift itself — not product rules or layout trivia.

Swift is Apple's modern language for apps and scripts. You can run small programs with the swift tool or build them with Swift Package Manager / Xcode.

print writes values to standard output and adds a newline by default. Parentheses are required for the call.

A one-file starter needs no main wrapper in a simple script — top-level code runs. In an app or executable target, entry is still clear: the first statements you intend to run.

Swift is case-sensitive. Print is not print. Smart quotes from a word processor will break string literals — use straight ASCII quotes.

Misses: forgetting parentheses on print, typing println (that is not Swift's name), or pasting curly quotes. Fix one thing. Rerun.

Put Hello, Swift in a sentence you could teach a friend: what changes, what stays the same, and what you expect from the still.

Change one dial at a time when you experiment, then re-run. Batch changes invent ghost bugs.

Predict the still on paper before you type. Prediction turns running into confirmation.

Name each token in the still aloud. Hesitation marks the exact gap.

When something fails, read the last error line first. Calm retries beat rewriting everything.

Open-book means the page is a tool. Pick the claim that matches what we traced.

Keep mistaken traces beside corrected ones. The diff is the real lesson.

print("hello")

Sit with that still. Trace it top to bottom. Name each piece. The exercise asks you to match its essence.

If something fails when you try it yourself, change one thing. Read the error. Return to the still. I will not rush you.

That is the lesson. When every quiz and exercise on this page is green, mark it passed. Next lesson when you are ready.