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---
id: 594810f028c0303b75339acc
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title: ABC Problem
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challengeType: 5
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forumTopicId: 302220
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dashedName: abc-problem
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---
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# --description--
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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 >
# --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 >
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# --hints--
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`canMakeWord` should be a function.
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```js
assert(typeof canMakeWord === 'function');
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```
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`canMakeWord` should return a boolean.
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```js
assert(typeof canMakeWord('hi') === 'boolean');
```
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`canMakeWord("bark")` should return true.
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```js
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assert(canMakeWord(words[0]));
```
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`canMakeWord("BooK")` should return false.
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```js
assert(!canMakeWord(words[1]));
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```
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`canMakeWord("TReAT")` should return true.
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```js
assert(canMakeWord(words[2]));
```
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`canMakeWord("COMMON")` should return false.
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```js
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assert(!canMakeWord(words[3]));
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```
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`canMakeWord("squAD")` should return true.
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```js
assert(canMakeWord(words[4]));
```
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`canMakeWord("conFUSE")` should return true.
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```js
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assert(canMakeWord(words[5]));
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```
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# --seed--
## --after-user-code--
```js
const words = ['bark', 'BooK', 'TReAT', 'COMMON', 'squAD', 'conFUSE'];
```
## --seed-contents--
```js
function canMakeWord(word) {
}
```
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# --solutions--
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```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;
}
```