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30secondsofcode
2019-06-05 09:55:25 +00:00
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@ -3,6 +3,7 @@
These snippets, while useful and interesting, didn't quite make it into the repository due to either having very specific use-cases or being outdated. However we felt like they might still be useful to some readers, so here they are.
## Table of Contents
* [`JSONToDate`](#jsontodate)
* [`squareSum`](#squaresum)
* [`binarySearch`](#binarysearch)
* [`celsiusToFahrenheit`](#celsiustofahrenheit)
* [`cleanObj`](#cleanobj)
@ -14,7 +15,6 @@ These snippets, while useful and interesting, didn't quite make it into the repo
* [`fibonacciUntilNum`](#fibonacciuntilnum)
* [`heronArea`](#heronarea)
* [`howManyTimes`](#howmanytimes)
* [`httpDelete`](#httpdelete)
* [`httpPut`](#httpput)
* [`isArmstrongNumber`](#isarmstrongnumber)
* [`isSimilar`](#issimilar)
@ -26,7 +26,7 @@ These snippets, while useful and interesting, didn't quite make it into the repo
* [`removeVowels`](#removevowels)
* [`solveRPN`](#solverpn)
* [`speechSynthesis`](#speechsynthesis)
* [`squareSum`](#squaresum)
* [`httpDelete`](#httpdelete)
---
### JSONToDate
@ -53,6 +53,27 @@ JSONToDate(/Date(1489525200000)/); // "14/3/2017"
<br>[⬆ Back to top](#contents)
### squareSum
Squares each number in an array and then sums the results together.
Use `Array.prototype.reduce()` in combination with `Math.pow()` to iterate over numbers and sum their squares into an accumulator.
```js
const squareSum = (...args) => args.reduce((squareSum, number) => squareSum + Math.pow(number, 2), 0);
```
<details>
<summary>Examples</summary>
```js
squareSum(1, 2, 2); // 9
```
</details>
<br>[⬆ Back to top](#contents)
### binarySearch
Use recursion. Similar to `Array.prototype.indexOf()` that finds the index of a value within an array.
@ -367,38 +388,6 @@ howManyTimes(100, -1); // Infinity
<br>[⬆ Back to top](#contents)
### httpDelete
Makes a `DELETE` request to the passed URL.
Use `XMLHttpRequest` web api to make a `delete` request to the given `url`.
Handle the `onload` event, by running the provided `callback` function.
Handle the `onerror` event, by running the provided `err` function.
Omit the third argument, `err` to log the request to the console's error stream by default.
```js
const httpDelete = (url, callback, err = console.error) => {
const request = new XMLHttpRequest();
request.open('DELETE', url, true);
request.onload = () => callback(request);
request.onerror = () => err(request);
request.send();
};
```
<details>
<summary>Examples</summary>
```js
httpDelete('https://website.com/users/123', request => {
console.log(request.responseText);
}); // 'Deletes a user from the database'
```
</details>
<br>[⬆ Back to top](#contents)
### httpPut
Makes a `PUT` request to the passed URL.
@ -739,21 +728,32 @@ speechSynthesis('Hello, World'); // // plays the message
<br>[⬆ Back to top](#contents)
### squareSum
### httpDelete
Squares each number in an array and then sums the results together.
Makes a `DELETE` request to the passed URL.
Use `Array.prototype.reduce()` in combination with `Math.pow()` to iterate over numbers and sum their squares into an accumulator.
Use `XMLHttpRequest` web api to make a `delete` request to the given `url`.
Handle the `onload` event, by running the provided `callback` function.
Handle the `onerror` event, by running the provided `err` function.
Omit the third argument, `err` to log the request to the console's error stream by default.
```js
const squareSum = (...args) => args.reduce((squareSum, number) => squareSum + Math.pow(number, 2), 0);
const httpDelete = (url, callback, err = console.error) => {
const request = new XMLHttpRequest();
request.open('DELETE', url, true);
request.onload = () => callback(request);
request.onerror = () => err(request);
request.send();
};
```
<details>
<summary>Examples</summary>
```js
squareSum(1, 2, 2); // 9
httpDelete('https://website.com/users/123', request => {
console.log(request.responseText);
}); // 'Deletes a user from the database'
```
</details>