{"id":34408,"date":"2024-11-01T09:27:48","date_gmt":"2024-11-01T09:27:48","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=34408"},"modified":"2024-11-01T11:41:23","modified_gmt":"2024-11-01T11:41:23","slug":"javascript-coding-test-course-lets-try-ddr","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/34408\/","title":{"rendered":"Javascript Coding Test Course, Let&#8217;s Try DDR"},"content":{"rendered":"<article>\n<header>\n<p>Many companies evaluate the algorithm and problem-solving abilities of applicants through coding tests. In this article, we will solve an algorithm problem that implements the DDR (Dance Dance Revolution) game using JavaScript.<\/p>\n<p>This article will detail the understanding of the problem, solution methods, code writing, and testing process.<\/p>\n<\/header>\n<section>\n<h2>Problem Description<\/h2>\n<p>Here is a simple version of the DDR game. The game proceeds in the following format.<\/p>\n<p>The user must press the corresponding keys based on the four arrows shown below:<\/p>\n<ul>\n<li>\u2191 (Up)<\/li>\n<li>\u2193 (Down)<\/li>\n<li>\u2190 (Left)<\/li>\n<li>\u2192 (Right)<\/li>\n<\/ul>\n<p>The goal of the game is to score points by accurately pressing the keys in the order of the given arrow inputs. If a wrong arrow is pressed, the user loses points.<\/p>\n<p>You need to write a function that receives user input and calculates the score when given n arrows. This function adds 1 point for each correct input matching the answer sequence and subtracts 1 point for each incorrect input.<\/p>\n<h3>Input Format<\/h3>\n<pre>\n        - Arrow array: [\"\u2191\", \"\u2193\", \"\u2190\", \"\u2192\"]\n        - User input array: [\"\u2191\", \"\u2191\", \"\u2190\", \"\u2192\", \"\u2193\"]\n        <\/pre>\n<h3>Output Format<\/h3>\n<p>Returns the user&#8217;s final score.<\/p>\n<\/section>\n<section>\n<h2>Problem Solving Process<\/h2>\n<p>To solve this problem, let&#8217;s first design the algorithm. The steps to solve the problem are as follows.<\/p>\n<ol>\n<li>Declare the arrow array and user input array.<\/li>\n<li>Initialize a variable to maintain the score.<\/li>\n<li>Iterate over user inputs and compare each input with the correct answers.<\/li>\n<li>If the input is correct, increase the score by 1; if incorrect, decrease it by 1.<\/li>\n<li>After checking all inputs, return the final score.<\/li>\n<\/ol>\n<p>Now that the algorithm is clear, let&#8217;s write the code.<\/p>\n<\/section>\n<section>\n<h2>Code Implementation<\/h2>\n<pre><code>\nfunction calculateScore(correctArrows, userArrows) {\n    let score = 0;\n\n    for (let i = 0; i &lt; userArrows.length; i++) {\n        if (userArrows[i] === correctArrows[i]) {\n            score += 1; \/\/ Correct\n        } else {\n            score -= 1; \/\/ Incorrect\n        }\n    }\n\n    return score; \/\/ Return final score\n}\n\n\/\/ Example usage\nconst correctArrows = [\"\u2191\", \"\u2193\", \"\u2190\", \"\u2192\"];\nconst userArrows = [\"\u2191\", \"\u2191\", \"\u2190\", \"\u2192\", \"\u2193\"];\n\nconst finalScore = calculateScore(correctArrows, userArrows);\nconsole.log(\"Final score is:\", finalScore);\n        <\/code><\/pre>\n<\/section>\n<section>\n<h2>Code Explanation<\/h2>\n<p>Let&#8217;s explain the code step by step.<\/p>\n<h3>1. Function Definition<\/h3>\n<p>The function <code>calculateScore<\/code> takes the arrow array and user input array as parameters. It initializes the <code>score<\/code> variable to 0 for score calculation.<\/p>\n<h3>2. Checking with Loop<\/h3>\n<p>Using a <code>for<\/code> loop, we iterate through the user input array. We check if each user&#8217;s input matches the correct arrows.<\/p>\n<p>If they match, we add 1 point; if they do not match, we subtract 1 point.<\/p>\n<h3>3. Return Final Score<\/h3>\n<p>After checking all user inputs, we return the <code>score<\/code> value. This value is the final score.<\/p>\n<\/section>\n<section>\n<h2>Code Testing<\/h2>\n<p>To verify that the code works correctly, let&#8217;s create some test cases.<\/p>\n<h3>Test Case 1<\/h3>\n<pre><code>\nconst correct1 = [\"\u2191\", \"\u2193\", \"\u2190\", \"\u2192\"];\nconst user1 = [\"\u2191\", \"\u2193\", \"\u2190\", \"\u2192\"];\n\nconsole.log(\"Test Case 1 - Score:\", calculateScore(correct1, user1)); \/\/ 4\n        <\/code><\/pre>\n<h3>Test Case 2<\/h3>\n<pre><code>\nconst correct2 = [\"\u2191\", \"\u2193\", \"\u2190\", \"\u2192\"];\nconst user2 = [\"\u2191\", \"\u2191\", \"\u2190\", \"\u2192\", \"\u2193\"];\n\nconsole.log(\"Test Case 2 - Score:\", calculateScore(correct2, user2)); \/\/ 2\n        <\/code><\/pre>\n<h3>Test Case 3<\/h3>\n<pre><code>\nconst correct3 = [\"\u2191\", \"\u2193\", \"\u2190\", \"\u2192\"];\nconst user3 = [\"\u2192\", \"\u2192\", \"\u2192\", \"\u2192\"];\n\nconsole.log(\"Test Case 3 - Score:\", calculateScore(correct3, user3)); \/\/ -4\n        <\/code><\/pre>\n<h2>Conclusion<\/h2>\n<p>In this article, we solved a basic algorithm problem of the DDR game using JavaScript. We were able to solidify the basics of JavaScript through basic problem-solving methods and code writing.<\/p>\n<p>This simple algorithm problem is one of the common types of problems that appear in interviews. Therefore, it&#8217;s beneficial to solve many similar problems and develop your own coding style. Thank you!<\/p>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Many companies evaluate the algorithm and problem-solving abilities of applicants through coding tests. In this article, we will solve an algorithm problem that implements the DDR (Dance Dance Revolution) game using JavaScript. This article will detail the understanding of the problem, solution methods, code writing, and testing process. Problem Description Here is a simple version &hellip; <a href=\"https:\/\/atmokpo.com\/w\/34408\/\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;Javascript Coding Test Course, Let&#8217;s Try DDR&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[141],"tags":[],"class_list":["post-34408","post","type-post","status-publish","format-standard","hentry","category-javascript-coding-test"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Javascript Coding Test Course, Let&#039;s Try DDR - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atmokpo.com\/w\/34408\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Javascript Coding Test Course, Let&#039;s Try DDR - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"Many companies evaluate the algorithm and problem-solving abilities of applicants through coding tests. In this article, we will solve an algorithm problem that implements the DDR (Dance Dance Revolution) game using JavaScript. This article will detail the understanding of the problem, solution methods, code writing, and testing process. 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