4 Es6 Js Object Json

ECMA Script 2015
Object
#JavaScript Notes
Index
 Object
 JSON Stringify
 JSON Parse
 Destructuring Assignment
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Javascript Object

Javascript Object
 In JavaScript, an object is an unordered collection of key-value pairs. Each
key-value pair is called a property.
objectname = {
Key: "Value",
Key: 0,
Key: "String",
}

How to Create Object?
 We can create object using {}.
 To create an object with properties, you use the key:value within the curly
braces
 The key of a property can be a string. And the value of a property can be any
value, e.g., a string, a number, an array, and even a function.
objectname = {
Key: "Value",
Key: 0,
Key: "String",
}

Create Javascript Object
 The person object has two properties firstName and lastName with the
corresponding values Akash' and Padhiyar'.

Accessing properties
 Use the dot notation ( .) or array-like notation ([]) to access a property of an
object.
 To access a property of an object, you use one of two notations:
1. the dot notation
2. array-like notation.

The dot notation (.)
 The following illustrates how to use the dot notation to access a property of
an object:
 objectName.propertyName

Array-like notation
 The following illustrates how to use the dot notation to access a property of
an object:
 objectName['propertyName']

Html Based Example

Checking if a property exists
 To check if a property exists in an object, you use the in operator:

Adding a new property to an object
 you can add a property to an object after object creation.

Modifying the value of a property
 To change the value of a property, you use the assignment operator (=).

Deleting a property of an object
 To delete a property of an object, you use the delete operator:

Nested Object

Object with Array

Object with Array

Print Using Loop

JSON.stringify()

JSON
 JavaScript Object Notation (JSON) is a standard text-based format for
representing structured data based on JavaScript object syntax.
 It is commonly used for transmitting data in web applications (e.g., sending
some data from the server to the client, so it can be displayed on a web page,
or vice versa).

About JSON
 key:value is the building block.
 { } contains an element.
 [ ] contains an array of elements.
 An element can have multiple key:value pairs.
 Value can be a simple value like number or string etc., or an element or an
array.
 Elements in an Array could be accessed using index
 Multiplekey:value pairs or elements are separated by comma

JSON Stringify
 The JSON.stringify() method converts a JavaScript object or value to a JSON string

Without JSON Convert Print

With JSON Stringify Print Data

JSON.parse()
 JSON Parse will convert JSON Data into Javascript Object.

JSON Parse

JS to JSON & JSON to JS Object

Destructuting Assignment

Destructuring Assignment
 Destructuring Assignment is a JavaScript expression that allows to unpack
values from arrays, or properties from objects, into distinct variables data
can be extracted from arrays, objects, nested objects and assigning to
variables

Example 1 : Without ES6

Example 1 : With ES6 ( Object Destructuring)

Example 2 : With ES6 ( Array Destructuring)

Array destructuring and Rest operator
var colors = ["Red","Green","Yellow","Violet","Indigo","Blue"];
//Destructuring Assignment
var [a,b,...args] = colors;
console.log(a); // Red
console.log(b); // Green
console.log(args); // [ 'Yellow', 'Violet', 'Indigo', 'Blue']

JavaScript Default
Parameters

JavaScript Default Parameters
 The concept of default parameters is a new feature introduced in the ES6
version of JavaScript. This allows us to give default values to function
parameters.

Example 1: Passing Parameter as Default Values
function sum(x = 1, y = x, z = x + y) {
console.log( x + y + z );
}
sum(); // 4

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ECMA Script 2015

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var colors = ["Red","Green","Yellow","Violet","Indigo","Blue"];

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