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algorithm: quadratic formula#1151
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| /** | ||
| * @function quadraticFormula | ||
| * @description This script will find the the roots of a quadratic equation. | ||
| * @param {number} a | ||
| * @param {number} b | ||
| * @param {number} c | ||
| * @return {array} | ||
| * @see https://en.wikipedia.org/wiki/Quadratic_formula | ||
| * @example quadraticFormula(1, -3, -4) = [4, -1] | ||
| * @example quadraticFormula(1, 5, 6) = [-2, -3] | ||
| * @example quadraticFormula(1, -3, 8) = [] | ||
| */ | ||
| const solveQuadraticEquation = (a, b, c) => { | ||
| if (typeof a !== 'number' || typeof b !== 'number' || typeof c !== 'number') { | ||
| return new TypeError('Some argument is not a number.') | ||
| } | ||
| const discriminant = (b ** 2) - (4 * a * c) | ||
| const denominator = 2 * a | ||
| let answer = [] | ||
| if (discriminant > 0) { | ||
| const x1 = (-b + Math.sqrt(discriminant)) / denominator | ||
| const x2 = (-b - Math.sqrt(discriminant)) / denominator | ||
| answer = [x1, x2] | ||
| } else if (discriminant === 0) { | ||
| const x = (-b) / denominator | ||
| answer = [x] | ||
| } | ||
| return answer | ||
| } | ||
| export { solveQuadraticEquation } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| import { solveQuadraticEquation } from '../QuadraticFormula' | ||
| test('Quadratic Equation', () => { | ||
| expect(solveQuadraticEquation(1, -3, -4)).toStrictEqual([4, -1]) | ||
| expect(solveQuadraticEquation(1, 5, 6)).toStrictEqual([-2, -3]) | ||
| expect(solveQuadraticEquation(3, 24, 48)).toStrictEqual([-4]) | ||
| expect(solveQuadraticEquation(1, -3, 8)).toStrictEqual([]) | ||
appgurueu marked this conversation as resolved. Show resolvedHide resolvedUh oh!There was an error while loading.Please reload this page. | ||
| expect(solveQuadraticEquation(1, -2, 9)).toStrictEqual([]) | ||
| }) | ||
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