Advent Of Code

day1.js

/*---------------part 1-----------------*/

let validCount = 0;
input.forEach(s => {
    let [left, password] = s.split(': ');    
    let [policy, charToCheck] = left.split(' ');    
    let [leastPolicy, mostPolicy] = policy.split('-');
    
    let occurence = password.split(charToCheck).length - 1;
    if(occurence >= leastPolicy && occurence <= mostPolicy) 
    {
        validCount++;
    }    
});

/*--------------part 2-------------------*/

let validCount = 0;
input.forEach(s => {
    let [left, password] = s.split(': ');    
    let [policy, charToCheck] = left.split(' ');
    
    let [leastPolicy, mostPolicy] = policy.split('-');    
    let leastIndex = +leastPolicy-1;
    let mostIndex = +mostPolicy-1;
    
    if(password[leastIndex] == charToCheck && 
       password[mostIndex] != charToCheck) {
        validCount++;
    } 
    
    if(password[mostIndex] == charToCheck && 
       password[leastIndex] != charToCheck) {
        validCount++;
    } 
});