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JavaScript Functions
This introduction to JavaScript functions will cover the basics of declaring and invoking functions. A function in JavaScript is a block of code that can be reused, making your scripts more modular and manageable.
function greet(name) {
console.log("Hello, " + name);
}
greet('World');
Console Output:
Hello, World
Variables and Constants
Introduction:
Understanding variables and constants is crucial in JavaScript. Variables can store data which can change over time, whereas constants are used for values that should remain static throughout the program execution.
let age = 25;
const birthYear = 1995;
age = 26; // age can be updated, but birthYear cannot
Console Output:
Updated Age: 26
Conditionals
Key Concepts:
Using conditionals like if-else statements allows you to execute different blocks of code based on certain conditions, which enhances decision-making capabilities within your JavaScript program.
let time = 10;
if (time < 12) {
console.log("Good morning");
} else {
console.log("Good afternoon");
}
Console Output:
Good Morning
Loops
Overview:
Loops are used in JavaScript to iterate through arrays or execute a block of code a specified number of times. The most commonly used loops include for, while, and do-while.
for (let i = 0; i < 5; i++) {
console.log("Iteration " + i);
}
Console Output:
Iteration 0
Iteration 1
Iteration 2
Iteration 3
Iteration 4
Arrays
Details:
Arrays hold multiple values in a single variable and are an essential feature in JavaScript. They provide various methods for adding, removing, and manipulating elements within the array.
let fruits = ['Apple', 'Banana', 'Cherry'];
console.log(fruits[1]); // Outputs: Banana
Console Output:
Banana
