String Interpolation

7. String Interpolation
   • Syntax
   • Expression Support
   • Type Handling
   • Implementation

7. String Interpolation #

✅ IMPLEMENTED: String interpolation is fully implemented and working with comprehensive test coverage.

7.1 Syntax #

String interpolation uses ${} syntax within double-quoted strings:

let name = "Alice"
let age = 30
let message = "Hello ${name}, you are ${age} years old"

7.2 Expression Support #

Any expression is valid inside interpolation:

let x = 10
let y = 5
print("Sum: ${x + y}")
print("Product: ${x * y}")
print("Complex: ${(x + y) * 2 - 1}")

7.3 Type Handling #

• String variables: Use %s format specifier
• Integer expressions: Use %ld format specifier
• Function calls: Supported for single-parameter functions

7.4 Implementation #

Interpolated strings are compiled to:

1. Allocate a buffer (alloca [1024 x i8])
2. Use sprintf to format the string
3. Use puts to output the result