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Create HexToDecimal.js

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Hello. Hope this can be useful to conversions in JavaScript repository :)
This commit is contained in:
Higor Castilho
2020-09-11 09:21:01 -03:00
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parent e757a001a0
commit 1a3a2639ba
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function hexToInt (hexNum) {
const numArr = hexNum.split('') // converts number to array
numArr.map((item, index) => {
if (!(item > 0)) {
switch (item) {
case 'A': return (numArr[index] = 10)
case 'B': return (numArr[index] = 11)
case 'C': return (numArr[index] = 12)
case 'D': return (numArr[index] = 13)
case 'E': return (numArr[index] = 14)
case 'F': return (numArr[index] = 15)
}
} else numArr[index] = parseInt(item)
})
return numArr // returns an array only with integer numbers
}
function hexToDecimal (hexNum) {
const intItemsArr = hexToInt(hexNum)
return intItemsArr.reduce((accumulator, current, index) => {
return accumulator + (current * Math.pow(16, (intItemsArr.length - (1 + index))))
}, 0)
}
// test cases
console.log(hexToDecimal('5DE9A')) // 384666
console.log(hexToDecimal('3D')) // 61