Javascirpt if/else vs switch vs object mapping

map.js

// Scenario, wher we need to determine a discount based on a customer's loyalty level

// 1. Traditional if-else approach:
function calculateDiscount(loyaltyLevel) {
    console.time('if else time');
    if (loyaltyLevel === 'GOLD') {
        applyGoldDiscount();
    } else if (loyaltyLevel === 'SILVER') {
        applySilverDiscount();
    } else if (loyaltyLevel === 'BRONZE') {
        applyBronzeDiscount();
    }
    console.timeEnd('if else time');
}

// 2. Alternative: a switch statement
function calculateDiscount(loyaltyLevel) {
    console.time('switch time');
    switch (loyaltyLevel) {
        case 'GOLD':
            applyGoldDiscount();
            break;
        case 'SILVER':
            applySilverDiscount();
            break;
        case 'BRONZE':
            applyBronzeDiscount();
            break;
    }
    console.timeEnd('switch time');
}

// 3. The simplicity of object mapping
function calculateDiscount(loyaltyLevel) {
    console.time('object time');
    const discountMap = {
        'GOLD': applyGoldDiscount,
        'SILVER': applySilverDiscount,
        'BRONZE': applyBronzeDiscount
    };
    discountMap[loyaltyLevel] && discountMap[loyaltyLevel]();
    console.timeEnd('object time');
}