Oct 25, 2024 · Oct 25, 2024
diff --git a/Maths/DecimalIsolate.js b/Maths/DecimalIsolate.js
diff --git a/Maths/test/DecimalIsolate.test.js b/Maths/test/DecimalIsolate.test.js
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		@@ -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) => {
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		@@ -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)
	}
	)
	})
	})