JS - Day 2

// Function without parameter and without return type

function add() {

console.log(9+9)

}

add()

// Function with parameter and without return type

function addB(x,y) {

    console.log(x+y)

}

addB(10,12)

// Function with parameter and with return type

function addC(x,y){

    return(x+y)

}

let q = addC(12,14)

console.log(q)

console.log(q+5)

console.log(q+q)

console.log(q-q)

// Data Types : number, boolean, string

let x2 = 23

console.log(typeof x2) // number // any +ve, -ve, fraction number is a number

let x3 = true

console.log(typeof x3) // boolean // any statement whose value or output is only true or false is a boolean

let x4 = "Ashish"

console.log(typeof x4) // string // any character written in single or double quote is considered as a string

// Comparison Operator // that compares LHS and RHS i.e. left hand side and right hand side

// < less than, > greater than, <= is less or equal, >= is greater or equal, != is not equal

// == is equal, === value equal & type equal, !== value not equal or type equal

// Value // this means only value is compared

console.log(5>8)        // meaning - 5 greater than 8 // output: false

console.log(8<9)        // meaning - 8 less than 9 // output: true

console.log(10==10)     // meaning - 10 is equal to 10 // output: true

console.log(10!=10)     // meaning - 10 is not equal to 10 // output: false

console.log(10<=11)     // meaning - 10 is less than OR equal to 11 // output: true // because one statement is correct

console.log(10>=11)     // meaning - 10 is greater than OR equal to 11 // output: false // because both statements are wrong

console.log(5=='5')     // meaning - value of 5 is equal to value of 5 // output: true // but here type of RHS is string

console.log(7>=5)       // meaning - LHS is greater than RHS OR equal to RHS // output: true // because one statement is correct

console.log(6<=6)       // meaning - LHS is less than OR equal to RHS // output: true

// Value and Type // this means value and type both compared

console.log(7==='7') // meaning - LHS value is equal to RHS and LHS data type is equal to RHS data type  // output: false // because data type is diff.// as LHS data type is number and RHS data type is string

console.log(1!==2) // meaning - LHS value is not equal to RHS or LHS data type is not equal RHS

// output: true // because one statement is true

console.log(1!=='2') // meaning - LHS value is not equal to RHS or LHS data type is not equal RHS

// output: true // because one statement is true

console.log(10!==10) // meaning - LHS value is not equal to RHS or LHS data type is not equal to RHS

// output: false // because both statements false

-blog by Ashish Naik