Santi's Small Summation Library

• 📘 Comes with built-in TypeScript definitions
• 🚀 Lightweight and fast
• 👴 Compliant with ECMAScript 3

API

• function sum(arr: number[]): number; Sum up the numbers in an array.

  Name	Type	Description	Optional?
  arr	number[]	An array of numbers.	No

  Returns the sum of all numbers in the array.

• function sum(fn: (n: number) => number, start: number, end: number, step?: number): number;

  Sums up numbers in [start, end] (with a step of step).

  Name	Type	Description	Optional?
  fn	(n: number) => number	A math function to process every number in the range.	No
  start	number	Inclusive start of the range.	No
  end	number	Inclusive end of the range.	No
  step	number	Optional step between every iteration (defaults to 1).	Yes

  Returns the sum of [start, end] with a step of step.

Usage

import sum from '@santi100/summation-lib'; // ESM
const sum = require('@santi100/summation-lib'); // CJS

// Example 1: Summing up numbers in an array
const arr = [1, 2, 3, 4, 5];
const result1 = sum(arr);
console.log(result1); // Output: 15

// Example 2: Summing up numbers in a range with a step
const fn = (n: number) => 1 / n;
const start = 1;
const end = 5;
const step = 2;
const result2 = sum(fn, start, end, step);
console.log(result2); // Output: 1.5333333333333332