Mobile Development - Lecture 6

 

Mobile Development- Using React Native - Lecture 6

Lecture Outcome:

At the end of the lecture, students will be able to know about

• BASIC DATA TYPE

• Programming basics

# BASIC DATA TYPE TALK
## DataTypes

## language builtins ( imperative data types )

number = integer/number
letter = 's' char
conditonal = boolean  {0|1} {false|true}


# non-imperative data type ( asi types jo kisi ko b apna ma convert kr la )
words =  "strings"
object = {}
    var x = {"value1":3, "value2": 2}

## javascript hates types #javaScript is typeAgnostic

<!-- //in other langaugee -->
const string x = "value";

<!-- in JS -->
    x = "value"
    x = 33
    x = 3.3
    x = true
    x = false



<!-- // in react we have prop-types package to handle type issues in JS -->

<!-- if you are going towards heavy math calculations do not use JS -> TS -->

# Programming basics p4

# conditionals

<!-- symbolic language/operators -->

= "barabr j, equals to"
== "shallow comparisons" ❌  '3' ==  3
=== "strtict compare" ✅ 
! "NOT"  
<!-- ya jis k sath lgta h uski qeemat ulat daita h
e.g
    x = true
    console.log(!x) => FALSE
 -->

 > "is Larger"
 < "is smaller"

 !== "not equals"

 !> "not larger/greater"
 !< "not smaller"


 <!-- x !> 30 -->
 <!-- car === corrola  -->
 <!-- BATMAN !> AquaMan  -->
 <!-- var doll = "elsa"   -->




 # conditionals

  - ifis 
  - switchers
  - (C-OP === "conditional operator" ?: )
  - C-OP door ka cousins ( && , || )


 # ifis

    if(x === 3) {}

<!-- for damange control we have ELSE HANDLERS  -->

    if(x === 3) {

    }else{

    }  
    
<!-- if Slip-Ups  -->

    if(x === 3) {

    }

    if (x ====4 ) {

    }

    if( x !== 3) {
        
    }

testTheories.js
// var x = 50

// if(x ===  30) {
//     console.log("yes its 30");
// }else {
//     console.log("ELSE BLOCK CHLA H");
// }


// if slipups

var x = 50


if (x === 50) {
    console.log(x);
    x = 40
}


if (x !== 50) {
    console.log(x);
}


testTypes.js
x = "hie"
console.log("=========================");
console.log(x);
console.log("=========================");

x = 33
console.log("=========================");
console.log(x);
console.log("=========================");

x = 3.3
console.log("=========================");
console.log(x);
console.log("=========================");

x= 's'
console.log("=========================");
console.log(x);
console.log("=========================");
x = false

console.log("=========================");
console.log(x);
console.log(