Tech_Doc

JavaScript Introduction

JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles.

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JavaScript is not a compiled language, but it is a translated language. The JavaScript Translator (embedded in the browser) is responsible for translating the JavaScript code for the web browser.

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Variables

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Keywords

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Conditional Statements

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Function declarations

                Demo :

                function calcRectArea(width, height) {
                    return width * height;
                  }
                  
                  console.log(calcRectArea(5, 6));
                  // Expected output: 30

                Syntax:

                function name(param0) {
                    statements
                  }
                  function name(param0, param1) {
                    statements
                  }
                  function name(param0, param1, /* … ,*/ paramN) {
                    statements
                  }

Javascript and Java

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Arrays

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Nested Arrays

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Objects

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                creating new object :

                const o = new Object();
                o.foo = 42;
                
                console.log(o);
                // { foo: 42 }

Nested Objects

                    let x = "";
            const myObj = {
            name: "John",
            age: 30,
            cars: [
                {name:"Ford", models:["Fiesta", "Focus", "Mustang"]},
                {name:"BMW", models:["320", "X3", "X5"]},
                {name:"Fiat", models:["500", "Panda"]}
            ]
            }