system.collection

The system.collection module provides higher-order functions for working with arrays and collections.

Import

import system.collection as c;

Functions

Transformation

• map(arr, fn) - Transform each element
• filter(arr, fn) - Keep elements matching predicate
• reduce(arr, fn, initial) - Reduce to single value

Queries

• find(arr, fn) - Find first matching element
• any(arr, fn) - Check if any match
• all(arr, fn) - Check if all match
• count(arr, fn) - Count matching elements

Array Operations

• length(arr) - Array length
• push(arr, val) - Add element
• pop(arr) - Remove last element
• slice(arr, start, end) - Extract subarray
• reverse(arr) - Reverse array
• sort(arr) - Sort array

Example

import system.collection as c;
import system.io as io;

let nums = [1, 2, 3, 4, 5];

// Map: double each number
let doubled = c.map(nums, (x) => x * 2);
io.out.println(doubled);  // [2, 4, 6, 8, 10]

// Filter: keep even numbers
let evens = c.filter(nums, (x) => x % 2 == 0);
io.out.println(evens);  // [2, 4]

// Reduce: sum all numbers
let sum = c.reduce(nums, (acc, x) => acc + x, 0);
io.out.println("Sum:", sum);  // 15