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algorithm: AbsoluteValue #31

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Merged
merged 1 commit into from
Oct 7, 2022
Merged

algorithm: AbsoluteValue #31

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16 changes: 16 additions & 0 deletions Maths/AbsoluteValue.ts
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/**
* @function AbsoluteValue
* @description Calculate the absolute value of an input number.
* @param {number} number - a numeric input value
* @return {number} - Absolute number of input number
* @see https://en.wikipedia.org/wiki/Absolute_value
* @example AbsoluteValue(-10) = 10
* @example AbsoluteValue(50) = 50
* @example AbsoluteValue(0) = 0
*/

export const AbsoluteValue = (number: number): number => {
// if input number is less than 0, convert it to positive via double negation
// e.g. if n = -2, then return -(-2) = 2
return number < 0 ? -number : number;
};
28 changes: 28 additions & 0 deletions Maths/test/AbsoluteValue.test.ts
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import { AbsoluteValue } from "../AbsoluteValue";

describe("AbsoluteValue", () => {
it("should return the absolute value of zero", () => {
const absoluteValueOfZero = AbsoluteValue(0);
expect(absoluteValueOfZero).toBe(0);
});

it("should return the absolute value of a negative integer", () => {
const absoluteValueOfNegativeInteger = AbsoluteValue(-34);
expect(absoluteValueOfNegativeInteger).toBe(34);
});

it("should return the absolute value of a positive integer", () => {
const absoluteValueOfPositiveInteger = AbsoluteValue(50);
expect(absoluteValueOfPositiveInteger).toBe(50);
});

it("should return the absolute value of a positive floating number", () => {
const absoluteValueOfPositiveFloating = AbsoluteValue(20.2034);
expect(absoluteValueOfPositiveFloating).toBe(20.2034);
});

it("should return the absolute value of a negative floating number", () => {
const absoluteValueOfNegativeFloating = AbsoluteValue(-20.2034);
expect(absoluteValueOfNegativeFloating).toBe(20.2034);
});
});