JSON

JSON

var obj = {"name": "Hari", "city":"Trichy,"Mother Tongue":"Tamil"}

var obj1 = [{name:"book" ,price:100},{name:"note" ,price:50},{name:"pen" ,price:10},{name:"pencil" ,price:5}]

var obj2 = {"name":"santhosh" ,"marks":[89,90,95,100]}

var arr = [1,2,3,4,5,6]

ARRAY METHOD / JSON ARRAY

FILTER

arr.filter((item)=>item<4) //[1,2,3]

function even (num){if(num%2==0) return "even"}

arr.filter((even)) // [2,4]

obj1.filter((item)=>item.price<=10) [{ name: "pen", price: 10 },{ name: "pencil", price: 5 }]

MAP

arr.map((item)=>item+1) // [2,3,4,5,6,7]

obj1.map((item)=>item.name) // [ "book", "note", "pen", "pencil" ]

REDUCE

arr.reduce((currentvalue,item)=>currentvalue+item,0) //21 // 0 is my current value

With reduce method we can perform add,sub,mul and divison

SOME,EVERY,INCLUDES

arr.some((item)=>item==4) // true

obj1.some((item)=>item.name=="book") //false

arr.every((item)=>item==4) // false

obj1.every((item)=>item.name=="book") //false

arr.includes(2) // true //simillar to some