10 Basic Coding Problems with Solutions in JavaScript

Today we solve 10 basic problems using javascript, it’s very easy to learn, also a trending language today.

1. To Add Two Numbers

We’re currently practicing performing basic addition operations with two integer numbers.

function sum(a, b) {
  return a + b;
}
var x = sum(5,6)
console.log(x);

# input 5 , 6
# output 11

2. Convert Celsius To Fahrenheit

We can implement the formula for converting Celsius to Fahrenheit in Python code by using the expression (0°C × 9/5) + 32 = 32°F.

function Celsius(c_temp) {
  return ((c_temp*9)/5)+32;
}
var f_temp = "Fahrenheit: "+Celsius(36);
console.log(f_temp);

# input 36
# output 96.8

3. Convert Kilometers To Miles in javascript

We know 1 kilometer is approximately equal to 0.62 miles, we can easily calculate the distance in miles by multiplying the distance in kilometers by 0.62.

function kmToMiles(km) {
  return km*0.62;
}
var km = "Miles: "+kmToMiles(5);
console.log(km);
# input 5
# output 3.1

4. Is A Number Positive Or Negative

We can easily determine whether a number is positive or negative using this logic: if the number is equal to or greater than zero, then it’s positive; otherwise, it’s negative.

function isPositive(num) {
    if (num >=0) {
  var check = "positive";
}
 else {
  var check = "negetive";
}
  return check;
}
num = 2
console.log(isPositive(num));

# input 2
# output positive
# input -3
# output negetive

5. Is A Number Even Or Odd

We can determine whether a number is even or odd by dividing it by 2 and checking the remainder (modulus). If the remainder is zero, then the number is even; otherwise, it’s odd.

function evenOrOdd(num) {
    if (num !=0) {
        if (num%2==0) {
            check = "even"
        }
         else {
            var check = "odd";
        }
        return check
    }
    else {
            "not even or odd"
        }
}

console.log(evenOrOdd(6))

# input 2
# output even
# input 3
# output odd

6. Find the Largest Number from a List

Here, we’re leveraging Python’s default function max(). Later on, we’ll explore implementing custom methods using loops or recursion.

function maxnum(num) {
    var temp_v = num[0];
    for (var i = 0; i < num.length; i++) {
        if (temp_v<num[i]) {
            temp_v=num[i];
        }
    }
    return temp_v;
}
var num = [5,10,2,9];
console.log(maxnum(num))

# input [2,5,3,1,4]
# output 5

7. Determine whether a year is a leap year or not

We can determine whether a year is a leap year by the following rules: if the year is divisible by 400, it’s a leap year. If it’s not divisible by 400 but divisible by 4 and not divisible by 100, then it’s also a leap year; otherwise, it’s not leap year.

function isLeapYear(year) {
        if ( year%400==0 || (year%4==0 && year%100!=0)) {
            console.log("Leap Year")
        }
        else{
            console.log("Not Leap Year")
        }

}

isLeapYear(1996)

# input 1996
# output leap year
# input 2300
# output not leap year

8. Find The Factorial Of A Number

The factorial of a non-negative integer 𝑛n, denoted by 𝑛!n!, is the product of all positive integers less than or equal to 𝑛n. For example:

𝑛!=𝑛×(𝑛−1)×(𝑛−2)×…×3×2×1n!=n×(n−1)×(n−2)×…×3×2×1

For instance, 5!=5×4×3×2×1=1205!=5×4×3×2×1=120.

function factorial(num) {
       var output=1;
       while (num>1) {
       output *= num;
       num = num -1;
    }
    return output
}

console.log(factorial(5))

# input 5
# output 120

see same problems solutions in python

If you don’t understand the syntax properly, then learn from here