Added Hex to Binary conversion #805

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	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 hexToBinary = (hexString) => {
	/*
	Function for convertung Hex to Binary

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

	*/

	let result = ''
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	hexString = hexString.split('')
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	hexString.forEach(c => { result += binLookup(c) })
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	return result
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	}

	export default hexToBinary

19 changes: 19 additions & 0 deletions Conversions/test/HexToBinary.test.js

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	import hexToBinary from '../HexToBinary'

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

	it('expects to return correct binary value for more than one hex digit', () => {
	expect(hexToBinary('EA')).toBe('11101010')
	})

	it('expects to test its robustness as it should be case-insensitive', () => {
	expect(hexToBinary('4d')).toBe('01001101')
	})

	it('expects to return correct hexadecimal value, matching (num).toString(2)', () => {
	expect(hexToBinary('F')).toBe(parseInt('F', 16).toString(2))
	})
	})

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