Strings and Interpolation

Overview

Echo strings support quotes, escapes, interpolation, and positional formatting.

Syntax

name: str = "Echo";
message: str = "Hello, ${name}!";
formatted: str = "Score: {}".format(42);

Example

name: str = "Echo";
count: int = 5;
ok: bool = true;
missing: dynamic = null;

say("Name: ${name}");
say("Count: ${count}");
say("OK: ${ok}");
say("Missing: ${missing}");
say("Hello, {}!".format(name));

Output

Name: Echo
Count: 5
OK: true
Missing: null
Hello, Echo!

Notes

Quotes

Both styles work:

a: str = "Echo";
b: str = 'Echo';

Escapes

Supported escapes:

\\
\"
\'
\n
	
\r

Interpolation

Interpolation uses Echo-style output rules, so booleans print as true and false, and null prints as null.

format(...)

Supported placeholders:

{}
{0}
{1}
{{
}}

Common Mistakes

Missing closing brace in interpolation

say("Hello ${name");

Expecting advanced formatting like width or precision

This is not supported.

Assuming single quotes are raw strings

Echo still processes escapes and interpolation tokenization.

Current Limitation

• format() only supports positional placeholders.
• No named formatting.
• No raw string syntax.
• Invalid characters inside ${...} may fail later than expected.

See Also

• Variables and Types
• Built-in Methods
• Known Limitations