First Steps in JS

JavaScript Examples

In this page we have simple solved examples for the lessons.

---

Example 1: Input and output

Read a number from the user and display it on the page.

var num;

num = Number(prompt("Enter a number"));

document.write("You entered: " + num);

---

Example 2: Basic numeric operators

Read two numbers and display their sum.

var a, b, result;

a = Number(prompt("Enter first number"));
b = Number(prompt("Enter second number"));

result = a + b;

document.write("Sum = " + result);

---

Example 3: Conditions

Read a grade and display Pass or Fail.

var grade;

grade = Number(prompt("Enter your grade"));

if (grade >= 50) {
    document.write("Pass");
} else {
    document.write("Fail");
}

---

Example 4: Loops

Display the numbers from 1 to 5.

var i;

for (i = 1; i <= 5; i++) {
    document.write(i + "<br>");
}