How to Use Statements and Expressions in JavaScript?

In JavaScript, statements are instructions that perform an action, while expressions are snippets of code that return a value.

Statements are used to control the flow of a program, execute an action, or define a block of code. Here are some examples of statements in JavaScript:

if (condition) {
  // statements to execute if the condition is true
} else {
  // statements to execute if the condition is false
}

for (let i = 0; i < 10; i++) {
  // statements to repeat 10 times
}

function myFunction() {
  // statements to define the behavior of the function
}

Expressions are used to produce a value, and can be used wherever a value is expected. Expressions are typically used to assign values to variables, perform arithmetic operations, or call functions that return a value. Here are some examples of expressions in JavaScript:

let x = 1 + 2; // expression that adds two numbers
let y = Math.sqrt(x); // expression that calculates the square root of x
let z = myFunction(); // expression that calls a function and returns its result

In JavaScript, statements and expressions are used together to build complex logic and perform various tasks in a program. Understanding the difference between statements and expressions is an important part of understanding how JavaScript works.