data type in javascript
var age = 18; // number
var name = "Jane"; // string
var name = {first:"Jane", last:"Doe"}; // object
var truth = false; // boolean
var sheets = ["HTML","CSS","JS"]; // array
var a; typeof a; // undefined
var a = null; // value nulljavascript data types
/*
The latest ECMAScript standard defines nine types:
Six Data Types that are primitives, checked by typeof operator:
undefined : typeof instance === "undefined"
Boolean : typeof instance === "boolean"
Number : typeof instance === "number"
String : typeof instance === "string"
BigInt : typeof instance === "bigint"
Symbol : typeof instance === "symbol"
Structural Types:
Object : typeof instance === "object". Special non-data but Structural type for any constructed object instance also used as data structures: new Object, new Array, new Map, new Set, new WeakMap, new WeakSet, new Date and almost everything made with new keyword;
Function : a non-data structure, though it also answers for typeof operator: typeof instance === "function". This is merely a special shorthand for Functions, though every Function constructor is derived from Object constructor.
Structural Root Primitive:
null : typeof instance === "object". Special primitive type having additional usage for its value: if object is not inherited, then null is shown;
*/javascript data types
/*JavaScript data types*/
//string
var string = 'ASCII text';
//int
var integer = 123456789;
//float
var float = 123.456;
//boolean, can be true or false
var t = true;
var f = false;
//undefined
var undef;//defaults to undefined
var undef = undefined;//not common, use null
//null
var nul = null;
//array
var arr = ['Hello','my','name','is','Dr.Hippo',123,null];
//object
var person = {'name':'John Smith','age':27};
//function
var fun = function(){
return 42;
}javascript data types
let x = "16" + "Volvo";js data types
//There are 7 data types in JS
//They're split in two categories - (Primitives and Complex Types)
//Primives
string, number, boolean, null, undefined
//Complex types
Object, Functionjs data types
/*
-----------------------------------------------------------
string | number | object | boolean | undefined
-----------------------------------------------------------
~ ~ ~ ~ ~
"Words" 22 [ array ] true -false X
. . { json } . . undefined
. . Null . . .
***
//Primives
string, number, boolean, null, undefined
//Complex types
Object, Function
*/Copyright © 2021 Codeinu
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