Oct 25, 2024
diff --git a/Maths/DecimalIsolate.js b/Maths/DecimalIsolate.js
 /*
 * function isolates the decimal part of a number.
 * Take the number and subtract it from the floored number.
 * Return the result.
 * This function isolates the decimal part of a number.
 * - If input is a number or a numeric string, it isolates and returns the decimal part.
 * - If input is an array:
 *    - It isolates the decimal part of the first element.
 *    - If the array contains more than one element, only the first element is considered.
 *    - If the array is empty, it returns 0.
 * - If input is not a number, a numeric string, or a valid first element array,
 *   the function returns 0.
 */

 export const decimalIsolate = (number) => {
diff --git a/Maths/test/DecimalIsolate.test.js b/Maths/test/DecimalIsolate.test.js
 import { decimalIsolate } from '../DecimalIsolate'

 const invalidInputs = [
  { input: NaN, description: 'NaN' },
  { input: null, description: 'null' },
  { input: undefined, description: 'undefined' },
  { input: 'a string', description: 'a string' },
  { input: { a: 54.34 }, description: 'an object' },
  {
    input: ['OneDotTwoThree', 4.56, 7.89],
    description: 'an array with invalid first element'
  }
 ]

 describe('DecimalIsolate', () => {
  it('should isolate the decimal part of a positive number', () => {
    expect(decimalIsolate(12.34)).toBe(0.34)
  })

  it('should isolate the decimal part of a negative number', () => {
    expect(decimalIsolate(-456.789)).toBe(0.789)
  })

  it('should return 0 when the number is a whole number', () => {
    expect(decimalIsolate(100)).toBe(0)
  })

  it('should isolate the decimal part of a number string', () => {
    expect(decimalIsolate('12.34')).toBe(0.34)
  })

  it('should isolate the decimal part of the first element of an array if it is convertible to a number', () => {
    expect(decimalIsolate([98.76, { a: 76.45 }])).toBe(0.76)
  })

  describe('Invalid Inputs', () => {
    it.each(invalidInputs)(
      'should return 0 for invalid input when input is $description',
      ({ input }) => {
        expect(decimalIsolate(input)).toBe(0)
      }
    )
  })
 })
Original file line number	Diff line number	Diff line change
		@@ -1,7 +1,12 @@
		/*
		* function isolates the decimal part of a number.
		* Take the number and subtract it from the floored number.
		* Return the result.
		* This function isolates the decimal part of a number.
		* - If input is a number or a numeric string, it isolates and returns the decimal part.
		* - If input is an array:
		* - It isolates the decimal part of the first element.
		* - If the array contains more than one element, only the first element is considered.
		* - If the array is empty, it returns 0.
		* - If input is not a number, a numeric string, or a valid first element array,
		* the function returns 0.
		*/

		export const decimalIsolate = (number) => {
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,44 @@
		import { decimalIsolate } from '../DecimalIsolate'

		const invalidInputs = [
		{ input: NaN, description: 'NaN' },
		{ input: null, description: 'null' },
		{ input: undefined, description: 'undefined' },
		{ input: 'a string', description: 'a string' },
		{ input: { a: 54.34 }, description: 'an object' },
		{
		input: ['OneDotTwoThree', 4.56, 7.89],
		description: 'an array with invalid first element'
		}
		]

		describe('DecimalIsolate', () => {
		it('should isolate the decimal part of a positive number', () => {
		expect(decimalIsolate(12.34)).toBe(0.34)
		})

		it('should isolate the decimal part of a negative number', () => {
		expect(decimalIsolate(-456.789)).toBe(0.789)
		})

		it('should return 0 when the number is a whole number', () => {
		expect(decimalIsolate(100)).toBe(0)
		})

		it('should isolate the decimal part of a number string', () => {
		expect(decimalIsolate('12.34')).toBe(0.34)
		})

		it('should isolate the decimal part of the first element of an array if it is convertible to a number', () => {
		expect(decimalIsolate([98.76, { a: 76.45 }])).toBe(0.76)
		})

		describe('Invalid Inputs', () => {
		it.each(invalidInputs)(
		'should return 0 for invalid input when input is $description',
		({ input }) => {
		expect(decimalIsolate(input)).toBe(0)
		}
		)
		})
		})