Fmt

The fmt module provides string formatting capabilities.

All the given examples assume the following imports:

let fmt = import('std/fmt');
let io = import('std/io');

Functions

• Functions
  • template

template

fmt.template(string) -> string

Takes a template string, evaluates it, and returns the final string. Does not modify the original string. A template string contains snippets of code in between the usual string content. These snippets of code must be valid Feral expressions and enclosed between opening and closing braces ({<expression here>}).

Example:

let x = 5, y = 10;
let template_str = '{x} + {y} = {x + y}';
io.println(fmt.template(template_str));

Gives the output:

5 + 10 = 15

Note that to avoid a pair of { and } being considered as part of template when calling fmt.template, just escape the opening brace ({) with double backslash (\\ (one for lexer, other for template function)). This will also leave the pair of braces as it is.

Example:

let x = 5, y = 10;
let template_str = '\\{x} + \\{y} = {x + y}';
io.println(fmt.template(template_str));

Gives the output:

{x} + {y} = 15

Nested templates are possible as well should they be required.