Extension.java

package com.booleanuk.extension;

import com.booleanuk.helpers.ExtensionBase;

public class Extension extends ExtensionBase {
    /*
        Implement the following methods:

        1. add, which accepts two floats and returns a float (both floats added together)

        2. add, which accepts two doubles and returns a double (both doubles added together)

        3. subtract, which accepts two floats and returns a float (first float minus second float)

        4. subtract, which accepts a String and a char and returns a string with all instances of the provided char removed

        5. multiply, which accepts two ints and returns an int (first int multiplied by second int)

        6. multiply, which accepts a string and an int, and returns a string containing the provided string
        as many times as the provided int separated by a comma. E.g.
        multiply("Hello", 3) -> "Hello,Hello,Hello"

        7. multiply, which accepts an array of Strings that each contain a number, and an int
        The method should return an array of ints that contain the value of multiplying each String number by the provided int
        E.g.
        multiply(["2", "7", "3"], 3) -> [6, 21, 9]
     */

    public float add(float num1, float num2){
        return num1 + num2;
    }

    public double add(double num1, double num2){
        return num1 + num2;
    }

    public float subtract(float num1, float num2){
        return num1 - num2;
    }

    public String subtract(String aString, char aChar){
        String alteredString = aString.replace(String.valueOf(aChar), "");
        return alteredString;
    }

    public int multiply(int num1, int num2){
        return num1*num2;
    }

    public String multiply(String string, int num){
        String alteredString = "";
        for (int i = 0; i < num; i++){
            if(num == i+1){
                alteredString += string;
            }
            else{
                alteredString += string + ",";
            }
        }
        return alteredString;
    }

    public int[] multiply(String[] stringArray, int num){
        int[] intArray = new int[stringArray.length];
        for(int i = 0; i < stringArray.length; i++){
            int convertedString = Integer.parseInt(stringArray[i]);
            intArray[i] = convertedString*num;
        }
        return intArray;
    }

}