Else If Statement in JavaScript

When you have multiple conditions to check, else if lets you chain them together. For many fixed values, switch is a cleaner alternative.

Else If Chains

let day = "Monday";

if (day === "Monday") {
    console.log("Start of the week!");
} else if (day === "Friday") {
    console.log("Almost weekend!");
} else if (day === "Saturday" || day === "Sunday") {
    console.log("It's the weekend!");
} else {
    console.log("It's a regular weekday.");
}

The Switch Statement

When comparing one value against many options, switch is cleaner:

let fruit = "apple";

switch (fruit) {
    case "apple":
        console.log("Apples are $1.50/kg");
        break;
    case "banana":
        console.log("Bananas are $1.00/kg");
        break;
    case "orange":
        console.log("Oranges are $2.00/kg");
        break;
    default:
        console.log("We don't have that fruit.");
}

Important: The break Keyword

Without break, execution "falls through" to the next case:

let grade = "B";

switch (grade) {
    case "A":
    case "B":
        console.log("Good job!");  // Both A and B reach here
        break;
    case "C":
        console.log("You passed.");
        break;
    default:
        console.log("Try harder.");
}

When to Use Which

• if/else if — for ranges and complex conditions
• switch — for comparing one variable against fixed values