std/convert

import "std/convert" as convert;

The module overloads conversion functions for their supported input types.

Function	Accepted inputs
toString(value) String	String, Bool, Char, integer, and floating-point types
toInt(value) Int	Bool, Char, integer, and floating-point types
toFloat(value) Float	Bool, Char, integer, and floating-point types
toFloat64(value) Float64	Bool, Char, integer, and floating-point types
toBool(value) Bool	String, Char, Bool, integer, and floating-point types
toChar(value) Char	Char and Int

Numeric conversions use the target type’s normal conversion rules. toBool(String) is true only for "true" and "1".

Parsing an integer

parseInt(raw: String) Int!ParseIntError accepts surrounding whitespace and an optional + or - sign:

import "std/convert" as convert;

fun main() Int {
    var port = convert.parseInt("8080") or err {
        eprintln("invalid port");
        return 1;
    };
    return port;
}

ParseIntError has Empty and InvalidDigit variants.