Counter 2 | #2665 | LeetCode Solution
Author: neptune | 04th-Sep-2023
Problem : Counter 2 | #2665 | LeetCode
Write a function createCounter. It should accept an initial integer init. It should return an object with three functions.
The three functions are:
1. increment() increases the current value by 1 and then returns it.
2. decrement() reduces the current value by 1 and then returns it.
3. reset() sets the current value to init and then returns it.
Example 1:
Input: init = 5, calls = ["increment","reset","decrement"]
Output: [6,5,4]
Explanation:
const counter = createCounter(5);
counter.increment(); // 6
counter.reset(); // 5
counter.decrement(); // 4
Example 2:
Input:
init = 0, calls = ["increment", "increment", "decrement", "reset", "reset"]
Output: [1,2,1,0,0]
Explanation:
const counter = createCounter(0);
counter.increment(); // 1
counter.increment(); // 2
counter.decrement(); // 1
counter.reset(); // 0
counter.reset(); // 0
Solution:
/**
* @param {integer} init
* @return { increment: Function, decrement: Function, reset: Function }
*/
var createCounter = function(init) {
var current = init;
return {
increment: function() {
current += 1;
return current;
},
decrement: function() {
current -= 1;
return current;
},
reset: function() {
current = init;
return current;
}
}
};
/**
* const counter = createCounter(5)
* counter.increment(); // 6
* counter.reset(); // 5
* counter.decrement(); // 4
*/
Explanation:
Here's an explanation of the code step by step:
1. We define the `createCounter` function, which takes an initial integer `init` as a parameter.
2. Inside the `createCounter` function, we create a variable `current` and set it to the initial value `init`. This variable will hold the current value of the counter.
3. We return an object with three functions: `increment`, `decrement`, and `reset`.
4. The `increment` function increases the `current` value by 1 and then returns the updated `current` value.
5. The `decrement` function reduces the `current` value by 1 and then returns the updated `current` value.
6. The `reset` function sets the `current` value back to the initial value `init` and then returns the updated `current` value.
7. Finally, we demonstrate the usage of the `createCounter` function by creating a counter with an initial value of 5 and calling the three functions on it, printing the results to the console.
#JavaScript #Hackerrank #Python #Motivation #AI #React.js #Testing #Interview #SQL #Selenium #LeetCode #Problem Solving #Machine learning #Java #GPT #AWS #API #IT #Algorithms #Github #Jobs #Microservice #Certifications #Projects #Google #Django #Story #Pip #Data Science #Postman #Health #Twitter #Elon Musk #Node.js
To Be Or Not To Be | #2704 | LeetCode SolutionAuthor: neptune | 03rd-Sep-2023
#JavaScript #LeetCode
Write a function that helps developers test their code. It should take in any value and return an object with the following two functions...
Apply Transform Over Each Element in Array | #2635 | LeetCode SolutionAuthor: neptune | 05th-Sep-2023
#JavaScript #LeetCode
Given an integer array `arr` and a mapping function `fn`, return a new array with a transformation applied to each element...
Counter | #2620 | LeetCode SolutionAuthor: neptune | 02nd-Sep-2023
#JavaScript #LeetCode
Given an integer n, return a counter function. This counter function returns n and then n + 1, n + 2, etc...
Function Composition | #2629 | LeetCode SolutionAuthor: neptune | 09th-Sep-2023
#JavaScript #LeetCode
Given an array of functions [f1, f2, f3, ..., fn], return a new function fn that is the function composition of the array of functions...
Arrow Functions in JavaScript | ES6Author: neptune | 26th-Mar-2023
#JavaScript #React.js
In this article, we will explore the syntax and usage of arrow functions in detail, along with some examples...
Array Reduce Transformation | #2626 | LeetCode SolutionAuthor: neptune | 09th-Sep-2023
#JavaScript #LeetCode
Given an integer array `nums` and a reducer function `fn`, and an initial value `init`, return a reduced array...
Different ways to handle state in React applicationsAuthor: neptune | 21st-Jun-2023
#JavaScript #React.js
This article explores different ways to manage states in React, including local component state, context API, and state management libraries like Redux...
Add Two Promises | #2723 | LeetCode SolutionAuthor: neptune | 12th-Sep-2023
#JavaScript #LeetCode
Given two promises `promise1` and `promise2`, return a new `promise`. `promise1` and `promise2` will both resolve with a number...
Is Object Empty | #2727 | LeetCode | JavaScript SolutionAuthor: neptune | 01st-Sep-2023
#JavaScript #LeetCode
Given an object or an array, return if it is empty...
Filter Elements from Array | #2634 | LeetCode SolutionAuthor: neptune | 06th-Sep-2023
#JavaScript #LeetCode
Given an integer array `arr` and a filtering function `fn`, return a filtered array `filteredArr`...
Chunk Array | #2677 | LeetCode SolutionAuthor: neptune | 19th-Sep-2023
#JavaScript #LeetCode
Given an array arr and a chunk `size`, return a `chunked` array...
Managing Virtual Environments in React JavaScript ProjectsAuthor: neptune | 28th-Jun-2023
#JavaScript #React.js
Virtual environments are a valuable tool in React JavaScript projects as they allow developers to isolate dependencies, manage package versions, and maintain project consistency...
Allow One Function Call | #2666 | LeetCode SolutionAuthor: neptune | 11th-Sep-2023
#JavaScript #LeetCode
Given a function `fn`, return a new function that is identical to the original function except that it ensures `fn` is called at most once...
Memoize | #2634 | LeetCode SolutionAuthor: neptune | 12th-Sep-2023
#JavaScript #LeetCode
A memoized function is a function that will never be called twice with the same inputs. Instead it will return a cached value...
All You Need to Know About Pure Functions & Impure Functions in JavaScriptAuthor: neptune | 02nd-Apr-2023
#JavaScript #React.js
You should try to use pure functions whenever possible and avoid using impure functions unless necessary...
Array Prototype Last | #2619 | LeetCode SolutionAuthor: neptune | 20th-Sep-2023
#JavaScript #LeetCode
Write code that enhances all arrays such that you can call the `array.last()` method on any array and it will return the last element...
From REST to GraphQL: The Future of API DesignAuthor: neptune | 25th-Feb-2024
#JavaScript
Unlike traditional REST APIs, GraphQL provides a more flexible and intuitive approach to data querying and retrieval...
A Guide to Writing Clean, Readable, and Maintainable Code in JavaScriptAuthor: neptune | 23rd-Feb-2024
#JavaScript
By incorporating these principles into your coding practices, you contribute to creating code that is not only functional but also maintainable and easily understandable by your peers...
6 Brilliant JavaScript Frameworks for Every DeveloperAuthor: neptune | 16th-Feb-2024
#JavaScript
JavaScript's web development with frameworks like Synaptic.js for neural networks, OpenCV.js for multimedia processing, D3.js for dynamic data visualizations, Compromise.js for efficient NLP, ConvNet...
State in React: Component State and Controlling BehaviorAuthor: neptune | 21st-Feb-2024
#JavaScript #React.js
React, a popular JavaScript library for building user interfaces, introduces the concept of state and lifecycle methods to help developers manage the dynamic nature of components...
Decode Secret Language of React: Game-Changer for Web DevelopersAuthor: neptune | 25th-Feb-2024
#JavaScript #React.js
JSX is a syntax extension for JavaScript recommended by React for describing what the UI should look like...
View More