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curriculum/challenges/english/10-coding-interview-prep/rosetta-code/abc-problem.md

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+---
+title: ABC Problem
+id: 594810f028c0303b75339acc
+challengeType: 5
+forumTopicId: 302220
+---
+
+## Description
+<section id='description'>
+You are given a collection of ABC blocks (e.g., childhood alphabet blocks). There are 20 blocks with two letters on each block. A complete alphabet is guaranteed amongst all sides of the blocks. The sample collection of blocks:
+<pre>
+(B O)
+(X K)
+(D Q)
+(C P)
+(N A)
+(G T)
+(R E)
+(T G)
+(Q D)
+(F S)
+(J W)
+(H U)
+(V I)
+(A N)
+(O B)
+(E R)
+(F S)
+(L Y)
+(P C)
+(Z M)
+</pre>
+</section>
+
+## Instructions
+<section id='instructions'>
+Implement a function that takes a string (word) and determines whether the word can be spelled with the given collection of blocks.
+Some rules to keep in mind:
+<ul>
+  <li>Once a letter on a block is used, that block cannot be used again.</li>
+  <li>The function should be case-insensitive.</li>
+</ul>
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>canMakeWord</code> should be a function.
+    testString: assert(typeof canMakeWord === 'function');
+  - text: <code>canMakeWord</code> should return a boolean.
+    testString: assert(typeof canMakeWord('hi') === 'boolean');
+  - text: <code>canMakeWord("bark")</code> should return true.
+    testString: assert(canMakeWord(words[0]));
+  - text: <code>canMakeWord("BooK")</code> should return false.
+    testString: assert(!canMakeWord(words[1]));
+  - text: <code>canMakeWord("TReAT")</code> should return true.
+    testString: assert(canMakeWord(words[2]));
+  - text: <code>canMakeWord("COMMON")</code> should return false.
+    testString: assert(!canMakeWord(words[3]));
+  - text: <code>canMakeWord("squAD")</code> should return true.
+    testString: assert(canMakeWord(words[4]));
+  - text: <code>canMakeWord("conFUSE")</code> should return true.
+    testString: assert(canMakeWord(words[5]));
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function canMakeWord(word) {
+
+}
+```
+
+</div>
+
+
+### After Test
+<div id='js-teardown'>
+
+```js
+const words = ['bark', 'BooK', 'TReAT', 'COMMON', 'squAD', 'conFUSE'];
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+function canMakeWord(word) {
+  const characters = 'BO XK DQ CP NA GT RE TG QD FS JW HU VI AN OB ER FS LY PC ZM';
+  const blocks = characters.split(' ').map(pair => pair.split(''));
+
+  const letters = [...word.toUpperCase()];
+  let length = letters.length;
+  const copy = new Set(blocks);
+
+  letters.forEach(letter => {
+    for (let block of copy) {
+      const index = block.indexOf(letter);
+
+      if (index !== -1) {
+        length--;
+        copy.delete(block);
+        break;
+      }
+    }
+  });
+  return !length;
+}
+
+```
+
+</section>