fundamental 2

console.log(typeof null)

console.log(typeof 'false')

• null & boolean

• null & string

• object & string

• object & boolean

const object = { name : "udin" }

let name;

object.name = name;

console.log(object.name)

• udin

• error

• undefined

• name

let i = 10;

while(i > 9) {

console.log(i);

}

i++;

• 10

• error

• infinite loop

• 11

perbedaan var dengan let?

• var dapat assign ulang let tidak dapat di assign ulang

• var dan let sama sama dapat declare ulang dan assign ulang

• var bisa declare dan assign ulang tetapi let hanya bisa assign ulang saja

• var bisa declare dan assign ulang tetapi let hanya bisa declare ulang saja

const name = udin;

name = hello;

console.log(name);

• udin

• udin is not defined

• hello

• hello is not defined

const nilai = 100;

if(nilai > 100) console.log("how??")

else if(nilai < 100) console.log("gws")

else console.log("selamatt")

• how

• gws

• selamat

• selamatt

const false = "true"

console.log(false)

• false

• true

• "true"

• error

const penjumlahan = (a,b) => a*b

console.log(penjumlahan(10))

• 10

• 100

• 0

• NaN

const array1 = [1, 2, 3, 4];

const array2 = [1, 2, 3, 4];

array1.concat(array2);

console.log(array1);

• [1,2,3,4]

• [1,2,3,4,[1,2,3,4]]

• [1,2,3,4,1,2,3,4]

• [[1,2,3,4],1,2,3,4]

const array1 = [1, 2, 3, 4];

array1.splice(3, 20, 6, 7);

console.log(array1);

• [1,2,3,4]

• [ 1, 2, 3, 6, 7 ]

• [1,2,3,4,6,7]

• [1,2,3]