Introduction to JavaScript

In this class, we have covered fundamental concepts related to the JavaScript.

Key Points

Computer Understand 0's and 1's
High-level and Low-level language
JavaScript is High-level programming language
ECMAScript (or ES) is the standardized scripting language specification upon which JavaScript is based. JavaScript engines are the software components responsible for interpreting and executing JavaScript code. Various browsers and environments have their own JavaScript engines that implement the ECMAScript specifications. Some of the well-known JavaScript engines include: v8, SpiderMonkey, JavaScriptCore,etc.

Data Types

There are two types of data Primitive and Non-Primitive.

Primitive Data Type:

Number
String
Boolean

Non-Primitive Data Type:

Object
Array
Function

Loop

for
while
do while

Examples


/*Traversing Array*/

const arr=[1,2,3,4]

for(let i=0;i<arr.length;i++){
    console.log(`Element at index ${i} is ${arr[i]}`)
}

/*Object*/

const obj={
    name:"100xDevs",
    values:"infinity"
}

console.log(obj)

/* Calling Function and Passing Function as Parameters */

function sum(index1,index2){
    return index1+index2;
}
function multiply(index1,index2){
    return index1*index2;
}
function divide(index1,index2){
    return index1/index2;
}
function Calculator(firstEl,secondEl,operation){
    return operation(firstEl,secondEl);
}

var sumAnswer=Calculator(10,5,sum);
var mulAnswer=Calculator(10,5,multiply);
var divideAnswer=Calculator(10,5,divide)

console.log(sumAnswer,mulAnswer,divideAnswer)

/*
Some Additional questions
1- Write a Function which return sum between 1 to 100.
2- Fibonacci services
3- Stary Pattern 
*/

Core Concept

Single-threaded and Multi-threaded
Asynchronous and Synchronous
Loosely and Strongly typed
Interpreter and Compiler
Native JS and APIs

Last updated on February 12, 2024