Table of Contents

    ../
    javascript_chaiOrCode

    Table of Contents

    VAR LET AND CONST (video-04)

    Modern js a sudhu matro let abong const use kora hoi karon. var er problem hocce var kno a scope kaj kore na. mane same name a akta varibale banale oi name a r kno varibale banano jai na

    var hello = "name"
function vhurum(){
  var hello = "hi"
  console.log(hello)
}
console.log(hello)
    print("Hello")

    DataTypes and ECMA (video-05)

    javascript a akta syntex ace use strict aydar mane hocce js er j enginee ace oita js er ay code ta k new code er moto treate korb karon js ager theke onk besi mordern abong evolbe hoice.

    ECMA

    ECMA hocce stander. Mane history er first er dike ak akta browser er system ak ak rokom cilo jar karone akta browser er jonno lekha code onno browser a kaj korto na. er pore ECMA ak jaigai hoye stander banai j code ay vabe e lekah hobe r browser gulo o ay code k ayvabe treate korbe…

    DataTypes

    NUMBER

    number hocce full number jemon

    let age = 33

    number er range hocce 2 to the power 53 jdi er theke boro number store korete hoi tahole bigint use kora lage…..normaly to lage na kintu onk boro company jemon meta, redit ay sob a dorkar pore

    STRING

    double othoba single qoute a ja ace sob string

    let name = "nothing"

    boolean

    True othoba false

    NULL

    null hocce akta standalone value

    UNDEFIEND

    UNDEFIEND hocce jdi kno variable declear kore oita te kno value assign kora na hoi tahole

    let area; 
console.log(area) //Undefiend

    symbol

    Symbol maily react type er jinis a use hoi ayta k unique dekhanor jonno use kroa hoi

    OBJECT

    object to data type j ta js er main data type

    KIVABE DATA TYPE DEKHA JAI

    data type dekhar jonno

    console.log(typeof "name")
console.log(typeof null)
console.log(typeof undifiend)

    ::RESULT:: string object undefined

    inteview te ay quetion ta ase j null er data type ki? oitar ans hobe hocce object. Kintu undefined abr akta indivudual data type.

    DATA TYPE CONVERSTION CONFUSION (video-06)

    CONVERSTION hocce akta dataType dia onno data type a convert kora string to number number to float float to number etc.

    akta kahini string to number er

    let age = "33"
console.log(typeof age)
let newAge = Number(age)
console.log(typeof newAge)
console.log(newAge)

    ::RESULT:: string number 33

    akhn jdi string er vitore kno charecter thake tkhn ki hobe?

    let age = "33abc"
console.log(typeof age)
let newAge = Number(age)
console.log(typeof newAge)
console.log(newAge)

    ::RESULT:: string number NaN

    NaN not a number mane ayda js er akta kahini j jdi charecter o theke tao nmbr a convert kore kintu oitar akta specila data type a convert kore ja hocce not a nmbr

    let age = null
console.log(typeof age)
let newAge = Number(age)
console.log(typeof newAge)
console.log(newAge)

    ::RESULT:: object number 0

    null k number a convert korle hoi 0 r undefined k convert korle hoi NaN

    BOOLEAN CONVERSTION

    1 = true 0 = fasle | True | False | | 1 | 0 | | “string” | “” |

    CONFIUSION BETWEEN STRING TO NUMBER CONVERSTION (video-07)

    Operation mane hocce +,-,*,/ ay sob

    console.log(2+2)
console.log(2-2)
console.log(2/2)
console.log(2*2)
console.log(2**2)
console.log(2%2)

let value = 3
value = -value
console.log(value)

    kemon jeno ay code gulo

    console.log(2 + 1 + "1")
//31
console.log("2" + 1 + 1) 
//211
    console.log(+true)
//1
console.log(+"")
//0

    ++ prefix a rakhle ki hoi r last a rakhle ki hoi

    mdn docs

    Comparison of datatypes in javascript (video-08)

    console.log(null > 0)
console.log(null == 0)
console.log(null >= 0)
--- Output
false
false
true

    equalit == r Comparison alada vabe kaj kore Comparison <,>,!= same data type baniye nei ay jonno null 0 hoye jai r last a oita k true show kore

    Strict check

    js a == data type check kore na jemon “1” == 1 true, jdio akta strirng r akta int….ay jonno equalit check er jonno sob smy === use kora hoi . Main kotha hocce == data type check kore na r === data type check kore Comparison kore

    console.log("2" == 2)
console.log("2" === 2)
--- Output
true
false

    Data types of javascript summary (video-09)

    js er data type mainly 2 vag a vag kora. premitive r Non-premetive. premitive r Non-premetive hisab kora hoi hocce kon vabe data k memory te rakha hoi abong access kora hoi oitar upore depend kore data type a ay dui vag a vag kora hoi

    PREMITIVE

    premitive a total 7 type er data type ace

    1. String
      String hocce normall “” er vitore ja ace ty
    2. Number
    3. BOOLEAN
    4. NULL null mane hocce kiccu na mane oita kno data type e na….null nijei alalda akta data type
    5. undefined undefined mane hocce akta variable declear kore oita te kno value dea hoi ni…ba variable ta te kno value nai