Codesignal Simple Example

1. Add

Write a function that returns the sum of two numbers.

Example :

• For param1 = 1 and param2 = 2, the output should be add(param1, param2) = 3.

Solution :

function add(param, ...otherParams) {    
    return param + (otherParams.length ? add(...otherParams) : 0);
}

2. CenturyFromYear

Given a year, return the century it is in. The first century spans from the year 1 up to and including the year 100, the second - from the year 101 up to and including the year 200, etc.

Example :

• For year = 1905, the output should be centuryFromYear(year) = 20;
• For year = 1700, the output should be centuryFromYear(year) = 17.

Solution :

function centuryFromYear(year) {
return Math.floor((year-1)/100) + 1;
}

3. CheckPalindrome

Given the string, check if it is a palindrome. (A palindrome is a string that reads the same left-to-right and right-to-left.)

Example :

• For inputString = "aabaa", the output should be checkPalindrome(inputString) = true;
• For inputString = "abac", the output should be checkPalindrome(inputString) = false;
• For inputString = "a", the output should be checkPalindrome(inputString) = true.

Solution :

function checkPalindrome(inputString) {
    return inputString == inputString.split('').reverse().join('');
}

4. AdjacentElementsProduct

Given an array of integers, find the pair of adjacent elements that has the largest product and return that product.

Example :

• For inputArray = [3, 6, -2, -5, 7, 3], the output should be adjacentElementsProduct(inputArray) = 21.

7 and 3 produce the largest product.

Solution :

function adjacentElementsProduct(inputArray) {
 var cb = Number.NEGATIVE_INFINITY;
    for(var i=0;i<inputArray.length-1;i++){
        if(inputArray[i]*inputArray[i+1] > cb){
          cb = inputArray[i]*inputArray[i+1];
        }
    }
  return cb;
}

5. ShapeArea

Below we will define an n-interesting polygon. Your task is to find the area of a polygon for a given n.

A 1-interesting polygon is just a square with a side of length 1. An n-interesting polygon is obtained by taking the n - 1-interesting polygon and appending 1-interesting polygons to its rim, side by side.

Example :

• For n = 2, the output should be shapeArea(n) = 5;
• For n = 3, the output should be shapeArea(n) = 13.

Solution :

function shapeArea(n) {
    return 2*Math.pow(n,2) - 2*n +1;
}