JS - Day 4

/// String: string is the collection of characters. 

// string is written in single or double quote or back quote 

// Example of string

let a = 'Ram'       // written in single quote 

let b = "Sham"      // written in double quote

let c = `Laxman`    // written in back quote

let d = '1234'      // numbers written in quote is also a string

//* In Javascript everything is an object so every object have some properties and methods

// example: our body is an object it has properties like weight, height, colour etc. 

// and the methods are walk, talk, sleep, sit etc. and performing that methods is action and when we get

// something because of that then its is a return. like we do exercise and we get good muscles as a return.

// like the above said example every object in JavaScript has properties & methods and method includes action and return

//* In string every character has a stored index number

// Example of stored index number in string :

let e = 'Sita' // here stored index value of S is 0, i is 1, t is 2, a is 3 

// if we type console.log(e[0]) then it will return S

console.log(e[0])

// if we type console.log(e[1]) ir will return i

console.log(e[1])

let z = 'Rameshwar'

console.log(z[6]) // this will return character with index value 6 i.e. w

//* string has length property

let f = e.length    // we have stored length code in f variable for getting length of string named 'e'

console.log(f)

// or we can directly just see the length in console without storing length code in other variable like we 

// have stored e.length code in f variable // we can type console.log(e.length) but it will just show us result 

// but storing the code in other variable is good so that we can use it whenever we need

console.log(e.length)  

let sir = 'Deshpande'

let g = sir.length

console.log(g)  // this will return length of string named 'sir' in number type (i.e. in number) // return: 9

let x = z.length

console.log(x)  // this will return length of string named 'z' in number type (i.e. in number)  // return: 9

//* methods of string

//1) toUpperCase()

let district = 'nagpur'

let p = district.toUpperCase()

console.log(p)

//2) toLowerCase()

let state = 'MAHARASHTRA'

let q = state.toLowerCase()

console.log(q)

//3) indexOf()

let r = state.indexOf('T')

console.log(r)

//4) includes()

let t = state.includes('T')

console.log(t)