Extension.java

package com.booleanuk.extension;

import com.booleanuk.helpers.ExtensionBase;

public class Extension extends ExtensionBase {

    public float add(float float1, float float2) {
        return float1 + float2;
    }

    public double add(double d1, double d2) {
        return d1 + d2;
    }

    public float subtract(float f1, float f2) {
        return f1-f2;
    }

    public String subtract(String str, char c) {
        String res = "";
        for (int i = 0; i < str.length(); i ++) {
            if (str.charAt(i) != c) {
                res += str.charAt(i);
            }
        }
        return res;
    }
    /*
        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"


     */
    public int multiply(int i1, int i2) {
        return i1 * i2;
    }

    public String multiply(String str, int i) {
        String res = str + ",";
        while (i > 2) {
            res += str + ",";
            i --;
        }
        res += str;
        return res;
    }

    /*
    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 int[] multiply(String[] iString, int factor) {
        int[] res = new int[iString.length];
        for (int i = 0; i < iString.length; i ++) {
            res[i] = Integer.parseInt(iString[i]) * factor;
        }
        return res;
    }


}