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Returning a decimal that have 1s in its binary form only at indices specified by array in JavaScript
Problem
We are required to write a JavaScript function that takes in an array of unique non-negative integers. Our function should return a 32-bit integer such that the integer, in its binary representation, has 1 at only those indexes (counted from right) which are in the sequence.
Example
Following is the code −
const arr = [1, 2, 0, 4];
const buildDecimal = (arr = []) => {
const bitArr = Array(31).fill(0);
let res = 0;
arr.forEach(el => {
bitArr.splice((31 - el), 1, 1);
})
bitArr.forEach((bit, index) => {
res += (2 * (31-index) * bit);
});
return res;
};
console.log(buildDecimal(arr));Output
Following is the console output −
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Updated on: 20-Apr-2021
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