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Merge pull request TheAlgorithms#274 from higorcastilho/patch-2
Create HexToDecimal.js
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Conversions/HexToDecimal.js

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function hexToInt (hexNum) {
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const numArr = hexNum.split('') // converts number to array
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numArr.map((item, index) => {
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if (!(item > 0)) {
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switch (item) {
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case 'A': return (numArr[index] = 10)
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case 'B': return (numArr[index] = 11)
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case 'C': return (numArr[index] = 12)
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case 'D': return (numArr[index] = 13)
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case 'E': return (numArr[index] = 14)
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case 'F': return (numArr[index] = 15)
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}
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} else numArr[index] = parseInt(item)
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})
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return numArr // returns an array only with integer numbers
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}
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function hexToDecimal (hexNum) {
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const intItemsArr = hexToInt(hexNum)
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return intItemsArr.reduce((accumulator, current, index) => {
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return accumulator + (current * Math.pow(16, (intItemsArr.length - (1 + index))))
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}, 0)
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}
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// test cases
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console.log(hexToDecimal('5DE9A')) // 384666
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console.log(hexToDecimal('3D')) // 61

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