binary to int javascript

1var digit = parseInt(binary, 2);

1let binary = 0001
2parseInt(binary, 2)
3// returns 1

1const binaryArrayToNumber = arr => {
2    let len = arr.length
3    let pow = []
4    let decimal = []
5    for(let i = 0; i <= len - 1; i++){
6        pow.unshift(i)
7    }
8    arr.forEach((x,index) => {
9        decimal.push(x*2**pow[index])
10    })
11    let toDecimal = decimal.reduce((acc, curr) => acc + curr, 0)
12    return toDecimal
13};
14console.log(binaryArrayToNumber([1, 0, 1, 1]))