Lesson 7 — Strings

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What are we learning?

A string is text. In Echo its type name is str.

You already used strings with say("Hello, Echo!");. This lesson shows how to build text from variables.

Putting a value inside text

name: str = "Echo";
say("Hello, ${name}!");

Output

Hello, Echo!

${name} means: insert the value of name here.

This only works inside quotes that Echo treats as interpolating strings (normal "..." and '...' strings do).

Quotes

Both styles work for ordinary text:

a: str = "Echo";
b: str = 'Echo';
say(a, b);

Output

Echo Echo

Try it

Store your name in a variable. Print Hello, <your name>! using ${...}.

Predict it

city: str = "Oslo";
say("City: ${city}");

Show answer

City: Oslo

Fix it — unfinished ${...}

This fails (missing }):

say("Hello ${name");

Close the ${ with }.

Deeper (later)

format, escapes, and triple-quoted blocks are in Strings and Interpolation (full).

Next

→ Lesson 8 — Organizing programs