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Input / Output (I/O)

Arden provides built-in functions for console I/O operations. These are compiler intrinsics that map directly to system calls.

For print, println, and read_line, add: import std.io.*;

Output Functions

print(message: Integer | Float | Boolean | String | Char | None, ...): None

Prints supported scalar values to standard output without a newline character at the end. Multiple arguments are printed in order with no separator. Complex values such as Option<T> are currently rejected until structured formatting exists.

import std.io.*;

print("Hello, ");
println("World!"); // Output: Hello, World!
print(true, " ", '🚀', " ", None); // Output: true 🚀 None

println(message: Integer | Float | Boolean | String | Char | None, ...): None

Prints supported scalar values to standard output followed by a newline character.

import std.io.*;

println("Status: OK");

Input Functions

read_line(): String

Reads a line of text from standard input (stdin). Returns the string including the newline character (if present). Longer input lines are supported without truncation through a growing internal buffer.

import std.io.*;

print("Enter name: ");
name: String = read_line();
println("Hello, " + name);

File I/O Functions

The File object provides static methods for interacting with the file system.

File.read(path: String): String

Reads the entire content of a text file. Missing or inaccessible files fail immediately instead of silently producing an empty string. Files containing embedded 0x00 bytes are rejected at runtime instead of being silently truncated. Invalid UTF-8 byte sequences are also rejected at load time instead of leaking into later string operations. Non-seekable paths such as FIFOs are rejected with a direct runtime error instead of being treated like normal files.

content: String = File.read("data.txt");

File.write(path: String, content: String): Boolean

Writes the given content to a file. Overwrites the file if it already exists. Returns true only if both the write and final close/flush succeed.

success: Boolean = File.write("output.txt", "Hello, Arden!");

File.exists(path: String): Boolean

Checks if a readable regular file exists at the given path. Directories return false.

import std.io.*;

if (File.exists("config.json")) {
    println("Config found");
}

File.delete(path: String): Boolean

Deletes a regular file from the file system. Returns true if successful. Directories return false.

File.delete("temp.log");
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