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Commit 0e8a5f3

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Refactor solutions
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‎README.md

Lines changed: 27 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -1399,7 +1399,7 @@ console.log(reverse(1534236469)); // 0
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const reverse = x => {
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const MAX = Math.pow(2, 31) - 1;
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const MIN = -1 * Math.pow(2, 31);
1402-
let arr = Math.abs(x).toString().split('');
1402+
const arr = Math.abs(x).toString().split('');
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const reversed = Math.sign(x) * Number(arr.reverse().join(''));
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return reversed < MIN || reversed > MAX ? 0 : reversed;
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};
@@ -1472,7 +1472,8 @@ const kidsWithCandies = (candies, extraCandies) => {
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// Your solution
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};
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1475-
console.log(kidsWithCandies([2, 2, 1, 1, 2], 1)); // [true, false, false, false, false];
1475+
console.log(kidsWithCandies([12, 1, 12], 10)); // [true, false, true]
1476+
console.log(kidsWithCandies([4, 2, 1, 1, 2], 1)); // [true, false, false, false, false]
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```
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<details><summary>Solution</summary>
@@ -1530,9 +1531,9 @@ You are given an `m x n` integer grid `accounts`, where `accounts[i][j]` is the
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Input: accounts = [[1,5],[7,3],[3,5]]
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Output: 10
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Explanation:
1533-
1st customer has wealth = 6
1534-
2nd customer has wealth = 10
1535-
3rd customer has wealth = 8
1534+
1st customer has wealth = 1 + 5 = 6
1535+
2nd customer has wealth = 7 + 3 = 10
1536+
3rd customer has wealth = 3 + 5 = 8
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The 2nd customer is the richest with a wealth of 10.
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```
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@@ -1583,7 +1584,8 @@ const maximumWealth = accounts => {
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The marketing team is spending way too much time typing in hashtags. Let's help them with our own Hashtag Generator! Here's the deal:
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1586-
- It must start with a hashtag `#`
1587+
- It must start with a hashtag `#`.
1588+
- Ignore spaces in the input.
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- All words must have their first letter capitalized.
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- If the final result is longer than 140 chars it must return `false`.
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- If the input or the result is an empty string it must return `false`.
@@ -1593,26 +1595,35 @@ const generateHashtag = str => {
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// Your solution
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};
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1596-
console.log(generateHashtag('JavaScript')); // "#JavaScript"
1597-
console.log(generateHashtag('Do We have A Hashtag')); // "#DoWeHaveAHashtag"
1598+
console.log(generateHashtag('JavaScript')); // #JavaScript
1599+
console.log(generateHashtag('Do we have a Hashtag')); // #DoWeHaveAHashtag
1600+
console.log(generateHashtag(' Hello World ')); // #HelloWorld
1601+
console.log(generateHashtag('coding' + ' '.repeat(140) + 'for life')); // #CodingForLife
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console.log(generateHashtag('')); // false
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console.log(generateHashtag(' ')); // false
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console.log(generateHashtag('a'.repeat(140))); // false
1601-
console.log(generateHashtag('a'.repeat(139))); // #Aaaaaaa...
1602-
console.log(generateHashtag('coding' + ' '.repeat(140) + 'for life')); // "#CodingForLife")
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console.log(generateHashtag(' '.repeat(200))); // false
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```
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<details><summary>Solution</summary>
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```js
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const generateHashtag = str => {
1610-
let hashtag = str
1612+
const hashtag = str
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.split(' ')
16121614
.reduce(
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(tag, word) => tag + word.charAt(0).toUpperCase() + word.slice(1),
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'#'
16151617
);
1618+
1619+
// Alternative solution
1620+
// const hashtag =
1621+
// '#' +
1622+
// str
1623+
// .split(' ')
1624+
// .map(ele => ele.charAt(0).toUpperCase() + ele.substring(1))
1625+
// .join('');
1626+
16161627
return hashtag.length === 1 || hashtag.length > 140 ? false : hashtag;
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};
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```
@@ -1683,11 +1694,11 @@ console.log(count('aba')); // { a: 2, b: 1 }
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16841695
```js
16851696
const count = string => {
1686-
const result = {};
1687-
for (let char of string) {
1688-
result[char] = (result[char] || 0) + 1;
1697+
const frequency = {};
1698+
for (const char of string) {
1699+
frequency[char] = (frequency[char] || 0) + 1;
16891700
}
1690-
return result;
1701+
return frequency;
16911702
};
16921703
```
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@@ -1763,7 +1774,7 @@ const getNumericValue = str => {
17631774
const offset = 'a'.charCodeAt();
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const arr = [];
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1766-
for (let char of str) {
1777+
for (const char of str) {
17671778
arr.push(char.charCodeAt() - offset);
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}
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