everest.js

function everest(input) {
    let index = 0;
    let command = input[index];
    index++;
    let startMeters = 5364;
    let everestMeters = 8848;
    let dayCounter = 1;
    let end = true;

    while (command !== "END") {
        if (command === "Yes") {
            dayCounter++;
            if (dayCounter > 5) {
                end = false;
                console.log("Failed!");
                console.log(`${startMeters}`);
                break;
            }
            command = input[index];
            index++;
            let climbedMeters = Number(command);
            startMeters += climbedMeters;
        } else if (command === "No") {
            command = input[index];
            index++;
            let climbedMeters = Number(command);
            startMeters += climbedMeters;
        } else {
            let climbedMeters = Number(command);
            startMeters += climbedMeters;
        }

        if (startMeters >= everestMeters) {
            end = false;
            console.log(`Goal reached for ${dayCounter} days!`);
            break;
        }

        command = input[index];
        index++;
    }
    if (end) {
        if (startMeters >= everestMeters) {
            console.log(`Goal reached for ${dayCounter} days!`);
        } else {
            console.log("Failed!");
            console.log(`${startMeters}`);
        }
    }
}

everest(["Yes", "535", "Yes", "849", "Yes", "499", "Yes", "400", "Yes", "500"]);