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 one, float two) {
        return one + two;
    }

    public double add(double one, double two) {
        return one + two;
    }

    public float subtract(float one, float two) {
        return one - two;
    }

    public String subtract(String word, char letter) {
        return word.replaceAll(Character.toString(letter), "");
    }

    public int multiply(int one, int two) {
        return one * two;
    }

    public String multiply(String word, int number) {
        StringBuilder output = new StringBuilder();
        for (int i = 0; i < number; i++) {
            output.append(word);
            if (i < number - 1) {
                output.append(",");
            }
        }
        return output.toString();
    }

    public int[] multiply(String[] numbers, int multiplier) {
        int[] multiplied = new int[numbers.length];
        for (int i = 0; i < numbers.length; i++) {
            int current = Integer.parseInt(numbers[i]);
            multiplied[i] = current * multiplier;
        }
        return multiplied;
    }

}