JS part 2:

 Day 1:

filter() : filter() will always return new array. It will not modify existing array. isBiggerThanFive is the inline callback() function

var number = [0,1,2,3,4,5,6,7,8,9];

console.log(number.filter(isBiggerThanFive));

function isBiggerThanFive(n){

return n>5

}

In callback() function we can test the conditions and return to the callback()

find(): used to filter an element using Id. when the element was not found find() will return the undefined.

number.find(isBiggerThanFive);

loop():

var n = [0,1,2,3,4,5,6,7,8,9]

var filterArray=[];count = 0;

for(var i=0;i<=n.length-1;i++){

let el = a[i];

if(el>5){

filterArray.push(a[i]);

}else{ count += 1;}

}

findIndex(): we can get the element of index by using findIndex() method.

number.findIndex(4)

includes(): includes() will return true or false; true means value present in the array. number.includes(5);

There are two common functionalities that is loadData() and showData() related to web development.

loadData() can use window.fetch() 

function loadData(jsonUrl, onLoadCallBack){

window.fetch(jsonUrl).then((res)=> { return res.json()}).then((data)=>{onLoadCallBack(data)});

}

Summary:

filter & search: 

number.filter(): filter() => filter the data or element without changing existing array.

number.find(): find() => filter an element by using Id.

number.loop(): loop() => we can filter data or object by using loop

number.findIndex(): findIndex() => return index of value or element 

number.includes(): includes(): return true if value or element are existing in the array.