JavaScript Conditional Statements

Level : Beginner
Mentor: Shailendra Chauhan
Duration : 00:01:00

Control Flow:

Control flow refers to the order in which instructions are executed in a program. It determines the path the program takes based on conditions and decisions.

Default Control Flow Order:

In JavaScript, code is executed sequentially from top to bottom by default. This means that statements are processed in the order they appear in the code.

Control Structures and Conditionals:

Control structures like if statements, switch statements, and loops enable you to make decisions and control the flow of your program based on certain conditions.

if Statement:

The 'if' statement is used to execute a block of code if a specified condition is 'true'.


let temperature = 28;
if (temperature > 30) {
    console.log("It's a hot day.");

else Statement:

The 'else' statement is used alongside an 'if' statement. It executes a block of code when the condition of the 'if' statement is 'false'.


let weather = "rainy";
if (weather === "sunny") {
    console.log("It's sunny!");
} else {
    console.log("It's not sunny.");

switch Statement:

The 'switch' statement allows you to evaluate an expression against multiple possible case values and execute corresponding code blocks.


let day = "Monday";
switch (day) {
    case "Monday":
        console.log("Start of the week");
    case "Friday":
        console.log("End of the week");
        console.log("Somewhere in between");

Truthy and Falsy Values:

In JavaScript, values that are considered "truthy" evaluate to 'true' in boolean contexts, while "falsy" values evaluate to 'false'.


let username = ""; // Falsy
if (username) {
    console.log("Username provided.");
} else {
    console.log("Username not provided.");

else if Clause:

The 'else if' clause is used to specify an additional condition to check if the preceding 'if' or 'else if' conditions are false.


let grade = 85;
if (grade >= 90) {
} else if (grade >= 80) {
} else if (grade >= 70) {
} else {
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