angryProfessor.js

// https://www.hackerrank.com/challenges/angry-professo
function angryProfessor(k, a) {
    // establishing constants
    const YES = "YES";
    const NO  = "NO";

    let inClassCount = 0; // keeping running total
    for(const arrivalTime of a){ // looping through each arrivalTime; O(n)
        inClassCount += arrivalTime <= 0; // get boolean (true/false) if student is late or on time, adding (1/0) to total
        if(inClassCount >= k) return NO; // before loop is done, if the total count is past threshold, stop and return NO
    }
    return YES; // loop finished without issue, reutrn YES; Time Complexity = O(n)
}