binary-to-int.js

var getDecimalValue = function(head) {
    const items = [];
    let currentHead = head;
    
    while(currentHead !== null) {
        items.push(currentHead.val);
        currentHead = currentHead.next;
    }
    
    let sum = 0;
    let position = 0;
    
    while (items.length > 0) {
        sum += items.pop() === 0 ? 0 : (1 << position);
        position++;
    }
    
    return sum;
};