Upgraded `hexToBinary` function #910

Original file line number	Diff line number	Diff line change
		@@ -1,34 +1,41 @@
	const binLookup = (c) => {
	switch (c.toLowerCase()) {
	case '0': return '0000'
	case '1': return '0001'
	case '2': return '0010'
	case '3': return '0011'
	case '4': return '0100'
	case '5': return '0101'
	case '6': return '0110'
	case '7': return '0111'
	case '8': return '1000'
	case '9': return '1001'
	case 'a': return '1010'
	case 'b': return '1011'
	case 'c': return '1100'
	case 'd': return '1101'
	case 'e': return '1110'
	case 'f': return '1111'
	default: return ''
	}
	}
	const binLookup = (key) => ({
	0: '0000',
	1: '0001',
	2: '0010',
	3: '0011',
	4: '0100',
	5: '0101',
	6: '0110',
	7: '0111',
	8: '1000',
	9: '1001',
	a: '1010',
	b: '1011',
	c: '1100',
	d: '1101',
	e: '1110',
	f: '1111'
	}[key.toLowerCase()]) // select the binary number by valid hex key with the help javascript object

		const hexToBinary = (hexString) => {
	if (typeof hexString !== 'string') {
	throw new TypeError('Argument is not a string type')
	}

	if (/[^\da-f]/gi.test(hexString)) {
	throw new Error('Argument is not a valid HEX code!')
	}
		/*
		Function for converting Hex to Binary

		1. We convert every hexadecimal bit to 4 binary bits
		2. Conversion goes by searching in the lookup table
	*/

	*/
	const hexLexemes = hexString.split('')
	return hexLexemes.map(lexeme => binLookup(lexeme)).join('')
	return hexString.replace(
	/[0-9a-f]/gi,
	lexeme => binLookup(lexeme)
	)
		}

		export default hexToBinary

14 changes: 13 additions & 1 deletion Conversions/test/HexToBinary.test.js

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Original file line number	Diff line number	Diff line change
		@@ -1,6 +1,18 @@
		import hexToBinary from '../HexToBinary'

	describe('hexToBinary', () => {
	describe('Testing hexToBinary', () => {
	it('expects throw error in invalid types', () => {
	expect(() => hexToBinary(false)).toThrowError()
	expect(() => hexToBinary(null)).toThrowError()
	expect(() => hexToBinary(23464)).toThrowError()
	})

	it('expects throw error in invalid hex', () => {
	expect(() => hexToBinary('Hello i am not a valid Hex')).toThrowError()
	expect(() => hexToBinary('Gf46f')).toThrowError()
	expect(() => hexToBinary('M')).toThrowError()
	})

		it('expects to return correct hexadecimal value', () => {
		expect(hexToBinary('8')).toBe('1000')
		})
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