JAVASCRIPT DATA TYPE CONVERSION

DATA TYPE CONVERSION

NUMBER TO STRING

var a = 10

String(a)

STRING TO NUMBER

var a = ‘10’

Number(a);

parseInt(a);

parseInt(“10.4”) or parseInt(“10.8”) = 10

parseFloat(a);

var b = ‘happy’

Number(b); = NAN

STRING TO ARRAY

var a = ‘happy ma’

split – 3 methods

Without Space

a.split(‘’) = [‘h’,’a’,’p’,’p’,’y’,’ ‘,’m’,’a’]

With Space /Comma

a.split(‘ ’) =[‘happy’,’ma’]

With Limit

a.split(‘ ’,1) =[‘happy’]

ARRAY TO STRING

var a = [1,2,3,4,5]

join – 3 methods

Without Comma

a.join(‘’) = ‘12345’

With Comma

a.join(‘,’) = ‘1,2,3,4,5’

With Space

a.join(‘ ‘) = ‘1 2 3 4 5’

ARRAY TO OBJECT

var a = ['a','b','c','d']

var b =Object.assign({},a) = object { 0: "a", 1: "b", 2: "c", 3: "d" }

OBJECT TO ARRAY

var a = { 0: "a", 1: "b", 2: "c", 3: "d" }

Object.keys(a) = [0,1,2,3]

Object.values(a) = [‘a’,’b’,’c’,’d’]

Object.entries(a) = [[0,’a’], [0,’b’], [0,’c’], [0,’d’]]

JAVASCRIPT