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Commit ccf7b46

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GP-47 Refactor
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‎5-0-functional-programming/src/main/java/com/bobocode/lambda_math_functions/FunctionMap.java‎

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package com.bobocode.lambda_math_functions;
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import com.bobocode.util.ExerciseNotCompletedException;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.function.Function;
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import com.bobocode.util.ExerciseNotCompletedException;
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/**
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* FunctionMap is an API that allows you to store and retrieve functions by string name. FunctionMap are stored in a

‎5-0-functional-programming/src/main/java/com/bobocode/lambda_math_functions/Functions.java‎

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package com.bobocode.lambda_math_functions;
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import com.bobocode.lambda_math_functions.FunctionMap;
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public class Functions {
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/**
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* A static factory method that creates an integer function map with basic functions:
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# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>Math functions exercise :muscle:
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# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>Math functions exercise 💪
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Improve your lambda and method reference skills
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### Task
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**FunctionMap** is an API that allows you to store and retrieve math functions by string name. Your job is to implement the *todo* section of `Functions.java` class using **Lambda expressions and method reference**, so all tests in `FunctionsTest.java` should pass
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### Pre-conditions :heavy_exclamation_mark:
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### Pre-conditions ❗
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You're supposed to be familiar with Java 8
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### How to start :question:
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### How to start ❓
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* Just clone the repository and start implementing the **todo** section, verify your changes by running tests
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* If you don't have enough knowledge about this domain, check out the [links below](#related-materials-information_source)
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* Don't worry if you got stuck, checkout the [exercise/completed](https://github.com/bobocode-projects/tdd-exercises/tree/exercise/completed/binary-search-tree) branch and see the final implementation
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* Don't worry if you got stuck, checkout the [exercise/completed](to do) branch and see the final implementation
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### Related materials :information_source:
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* [Lambda tutorial](https://github.com/bobocode-projects/java-8-tutorial/tree/master/lambdas) <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=20/>
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### Related materials i️
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* [Lambda tutorial](to do) <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=20/>
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* [State of lambda (JSR 335)](http://htmlpreview.github.io/?https://github.com/bobocode-projects/resources/blob/master/java8/lambda/sotl.html)
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