30-Days-Of-JavaScript/Exercise-Solutions/days/03_day_operators.md

Day 3 - Operators

Exercise:Solutions

• Exercise:Level 1

• Exercise:Level 2

• Exercise:Level 3

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Exercise Solutions

Exercise Level 1

1. Declare firstName, lastName, country, city, age, isMarried, year variable and assign value to it and use the typeof operator to check different data types.

let name = "nevzat"
let lastName = "atalay"
let country = "turkey"
let city = "bitlis"
let age = 25
let isMarried = true

console.log(typeof(name),typeof(lastName),typeof(country),typeof(city),typeof(age),typeof(isMarried))

2. Check if type of '10' is equal to 10

let number ="10"
console.log(number==10)

3. Check if parseInt('9.8') is equal to 10

let number = parseInt(9.8)
console.log(number==10)

4. Boolean value is either true or false.

• Write three JavaScript statement which provide truthy value.
• Write three JavaScript statement which provide falsy value.

console.log(!!"merhaba")
console.log(!!1)
console.log(!![])

console.log(!!"")
console.log(!!0)
console.log(!!null)

5. Figure out the result of the following comparison expression first without using console.log(). After you decide the result confirm it using console.log()

• 4 > 3
• 4 >= 3
• 4 < 3
• 4 <= 3
• 4 == 4
• 4 === 4
• 4 != 4
• 4 !== 4
• 4 != '4'
• 4 == '4'
• 4 === '4'
• Find the length of python and jargon and make a falsy comparison statement.

const arr = [
    4 > 3,
    4 >= 3,
    4 < 3,
    4 <= 3,
    4 == 4,
    4 === 4,
    4 != 4,
    4 !== 4,
    4 != '4',
    4 == '4',
    4 === '4',
    ]
console.log(arr)

let string = "phyton", string1 = "jargon"
console.log(string.length >= string1.length )

6. Figure out the result of the following expressions first without using console.log(). After you decide the result confirm it by using console.log()

• 4 > 3 && 10 < 12
• 4 > 3 && 10 > 12
• 4 > 3 || 10 < 12
• 4 > 3 || 10 > 12
• !(4 > 3)
• !(4 < 3)
• !(false)
• !(4 > 3 && 10 < 12)
• !(4 > 3 && 10 > 12)
• !(4 === '4')
• There is no 'on' in both dragon and python

const arr = [
    4 > 3 && 10 < 12,
    4 > 3 && 10 > 12,
    4 > 3 || 10 < 12,
    4 > 3 || 10 > 12,
    !(4 > 3),
    !(4 < 3),
    !(false),
    !(4 > 3 && 10 < 12),
    !(4 > 3 && 10 > 12),
    !(4 === '4')]
    console.log(arr)

let string = "phyton", string1 = "jargon"
console.log(string.includes("on") && string1.includes("on"))

7. Use the Date object to do the following activities

• What is the year today?
• What is the month today as a number?
• What is the date today?
• What is the day today as a number?
• What is the hours now?
• What is the minutes now?
• Find out the numbers of seconds elapsed from January 1, 1970 to now.

let now = new Date()

console.log(now.getFullYear())
console.log(now.getMonth()+1)
console.log(now.getDay())
console.log(now.getHours())
console.log(now.getMinutes())
console.log(now.getTime())

Exercise Level 2

1. Write a script that prompt the user to enter base and height of the triangle and calculate an area of a triangle (area = 0.5 x b x h).

Enter base: 20
Enter height: 10
The area of the triangle is 100

let width =Number(prompt("üçgenin genişligini giriniz"))
let height =Number(prompt("üçgenin yğksekliğini giriniz"))
let area = width*height / 2
console.log(area)

2. Write a script that prompt the user to enter side a, side b, and side c of the triangle and and calculate the perimeter of triangle (perimeter = a + b + c)

Enter side a: 5
Enter side b: 4
Enter side c: 3
The perimeter of the triangle is 12

let width =Number(prompt("üçgenin a kenarını  giriniz"))
let height =Number(prompt("üçgenin yüksekliğini giriniz"))
let widthb = Number(prompt("üçgenin b kenarını giriniz"))
let perimeter = width+height+widthb
console.log(perimeter)

3. Get length and width using prompt and calculate an area of rectangle (area = length x width and the perimeter of rectangle (perimeter = 2 x (length + width))

let width = Number(prompt("dikdörtgenin  genişliğini  giriniz"))
let height = Number(prompt("dikdörtgenin yüksekliğini giriniz"))
let perimeter = 2*(width+height) 
console.log(perimeter)

4. Get radius using prompt and calculate the area of a circle (area = pi x r x r) and circumference of a circle(c = 2 x pi x r) where pi = 3.14.

let r = 5
let area = Math.PI  *  r**2
console.log(area)

5. Calculate the slope, x-intercept and y-intercept of y = 2x -2

let slope = 2 //x in katsayısı egimi verir
let x_intercept = 1
let y_intercept = 2
console.log(`denklemin eğimi ${slope}, x in kesme noktası ${x_intercept}, y nin kesme noktası ${y_intercept} dir`)

6. Slope is m = (y2-y1)/(x2-x1). Find the slope between point (2, 2) and point(6,10)

let x1 =2 , x2 = 6
let y1 = 2 ,y2 =10
let slope =( y2 - y1 ) / (x2 - x1)
console.log(slope)

7. Compare the slope of above two questions.

let slope1 = 2
let slope2 = 2
console.log(slope1==slope2)

8. Calculate the value of y (y = x2 + 6x + 9). Try to use different x values and figure out at what x value y is 0.

let y = (x + 3)**2
let x = [-3,-2,-1,0,1,2,3]
y nin 0 debuggeri için x -3tür

9. Writ a script that prompt a user to enter hours and rate per hour. Calculate pay of the person?

Enter hours: 40
Enter rate per hour: 28
Your weekly earning is 1120

let hours = Number(prompt("günde kaç saat çalışıyorsunuz"))
let workingWage = Number(prompt("saatlik çalışma ücretinizi giriniz"))
let wage = hours*workingWage*30
console.log(`maaşınız ${wage} tl dir`)

10. If the length of your name is greater than 7 say, your name is long else say your name is short.

let myName = "nevzat"
if(myName.length > 7){
    console.log("adınız uzundur")
}
else{
    console.log("adınız kıssadır")
}

11. Compare your first name length and your family name length and you should get this output.

let firstName = 'Asabeneh'
let lastName = 'Yetayeh'

Your first name, Asabeneh is longer than your family name, Yetayeh

let myName = "nevzat"
let myLastName = "talay"
if(myName.length > myLastName.length){
 console.log(`adınız nevzat soyadınız atalaydan daha uzundur`)   
}
else{
    console.log("soyadınız atalay adınız nevzattan daha uzundur")
}

12. Declare two variables myAge and yourAge and assign them initial values and myAge and yourAge.

let myAge = 250
let yourAge = 25

I am 225 years older than you.

let myAge =25
let yourAge =18
let message = myAge - yourAge > yourAge - myAge ? "ben senden büyüğüm" : "sen benden büyüksün"
console.log(message)

13. Using prompt get the year the user was born and if the user is 18 or above allow the user to drive if not tell the user to wait a certain amount of years.

Enter birth year: 1995
You are 25. You are old enough to drive

Enter birth year: 2005
You are 15. You will be allowed to drive after 3 years.

let birtYear = Number(prompt("doğum yılınızı giriniz"))
let now = new Date()
let year = now.getFullYear()
let age = year - birtYear
if(age >=18){
    console.log("ehliyet sınavına başvuru yapabilirsiniz")
}
else{
    console.log(`ehliyet sınavına başvuru yapabilmeniz için ${18-age} yıl beklemeniz gerekmektedir`)
}

14. Write a script that prompt the user to enter number of years. Calculate the number of seconds a person can live. Assume some one lives just hundred years

Enter number of years you live: 100
You lived 3153600000 seconds.

let age = Number(prompt("kaç yaşındasınız"))
let lastSecond = age*365*24*60*60
let remainingSeconds = (100*365*24*60*60) - (lastSecond)
console.log(`en fazla ${remainingSeconds} saniye ömrÜn kaldı WAKW UP`)

15. Create a human readable time format using the Date time object

- YYYY-MM-DD HH:mm
- DD-MM-YYYY HH:mm
- DD/MM/YYYY HH:mm

let now = new Date()

let year = now.getFullYear()
let mount = now.getMonth()
let day = now.getDay()
let hours = now.getHours()
let minuts = now.getMinutes()

console.log(`${year}-${mount}-${day}           ${hours} : ${minuts}`)
console.log(`${day}-${mount}-${year}           ${hours} : ${minuts}`)
console.log(`${year} / ${mount} / ${day}       ${hours} : ${minuts}`)

Exercise Level 3

1. Create a human readable time format using the Date time object. The hour and the minute should be all the time two digits(7 hours should be 07 and 5 minutes should be 05 )

- YYY-MM-DD HH:mm eg. 20120-01-02 07:05

let now = new Date()

let year = now.getFullYear()
let mount = String(now.getMonth()+1).padStart(2,'0')
let day = String(now.getDate() ).padStart(2,'0')
let hour = String(now.getHours()).padStart(2,'0')
let minut = String(now.getMinutes()).padStart(2,'0')
console.log(`${day} / ${mount} / ${year} ${hour} : ${minut}`)

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