JavaScript assignment 2‏

simple.ts

// call by value  when you are used any the prmitive type  like
// number ,string ,boolean ,undefined ,null  like
// are always assigned/passed by
// value-copy: null, undefined, string, number, boolean, and ES6’s symbol.

// - First: Pass by value example
// some hint 
// The original variable is not modified on changes in other variables.	

let x=10; 
// which it is the value x is assign  to 10

let a = 2;
let b = a; // `b` is always a copy of the value in `a`
b++;
a; // 2
b; // 3


// refrance 
// any thing like array and object and function it just reference  value
// like
let numArr:number[]=[1,2,3]
let  copyarr = numArr; // `copyarr` is a reference to the shared `[1,2,3]` value

// when you create function 
function addOne(x:number){
    return ++x
}
// when you what to call it or used it  like this 
let tow=addOne(1)
// which tow refrance to the location that relized to some poin in to the addOne function
 let newObj = { greeting : 'call' };
    let someFature;
    someFature = newObj;
  
    // Mutating the value of c
    newObj.greeting = 'call by refrance';
    console.log(newObj) //{greeting:"'call by refrance';"}
    console.log(someFature);//{greeting:"'call by refrance';"}




    // call by value and refeance 
function multiplication(arr:number[]){
    let newCopy=[...arr]
    return newCopy.map(x=>x*2)
}
// call function 
let squire= multiplication(numArr)



// Make a function to get data from this API: "https://jsonplaceholder.typicode.com/todos/1", and don't forget to use error handling.

async function laodData():Promise<any>{
    try{
    const res=await fetch("https://jsonplaceholder.typicode.com/todos/1")
     let todosJson= await res.json()
     return console.log(todosJson)

    }
    catch(e){
        throw new Error(`ther are some error happend ${e}`)
    }

}


console.log(laodData());