Travis build: 1297 [cron]
This commit is contained in:
30secondsofcode
@ -6,24 +6,78 @@ These snippets, while useful and interesting, didn't quite make it into the repo
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## Table of Contents
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* [`binarySearch`](#binarysearch)
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* [`JSONToDate`](#jsontodate)
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* [`speechSynthesis`](#speechsynthesis)
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* [`binarySearch`](#binarysearch)
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* [`collatz`](#collatz)
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* [`countVowels`](#countvowels)
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* [`factors`](#factors)
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* [`fibonacciCountUntilNum`](#fibonaccicountuntilnum)
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* [`fibonacciUntilNum`](#fibonacciuntilnum)
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* [`howManyTimes`](#howmanytimes)
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* [`httpDelete`](#httpdelete)
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* [`collatz`](#collatz)
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* [`httpPut`](#httpput)
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* [`isArmstrongNumber`](#isarmstrongnumber)
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* [`JSONToDate`](#jsontodate)
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* [`quickSort`](#quicksort)
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* [`removeVowels`](#removevowels)
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* [`solveRPN`](#solverpn)
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* [`httpPut`](#httpput)
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* [`howManyTimes`](#howmanytimes)
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---
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### JSONToDate
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Converts a JSON object to a date.
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Use `Date()`, to convert dates in JSON format to readable format (`dd/mm/yyyy`).
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```js
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const JSONToDate = arr => {
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const dt = new Date(parseInt(arr.toString().substr(6)));
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return `${dt.getDate()}/${dt.getMonth() + 1}/${dt.getFullYear()}`;
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};
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```
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<details>
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<summary>Examples</summary>
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```js
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JSONToDate(/Date(1489525200000)/); // "14/3/2017"
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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### speechSynthesis
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Performs speech synthesis (experimental).
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Use `SpeechSynthesisUtterance.voice` and `window.speechSynthesis.getVoices()` to convert a message to speech.
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Use `window.speechSynthesis.speak()` to play the message.
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Learn more about the [SpeechSynthesisUtterance interface of the Web Speech API](https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance).
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```js
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const speechSynthesis = message => {
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const msg = new SpeechSynthesisUtterance(message);
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msg.voice = window.speechSynthesis.getVoices()[0];
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window.speechSynthesis.speak(msg);
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};
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```
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<details>
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<summary>Examples</summary>
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```js
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speechSynthesis('Hello, World'); // // plays the message
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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### binarySearch
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Use recursion. Similar to `Array.indexOf()` that finds the index of a value within an array.
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@ -57,28 +111,21 @@ binarySearch([1, 4, 6, 7, 12, 13, 15, 18, 19, 20, 22, 24], 21); // -1
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<br>[⬆ Back to top](#table-of-contents)
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### speechSynthesis
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### collatz
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Performs speech synthesis (experimental).
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Applies the Collatz algorithm.
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Use `SpeechSynthesisUtterance.voice` and `window.speechSynthesis.getVoices()` to convert a message to speech.
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Use `window.speechSynthesis.speak()` to play the message.
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Learn more about the [SpeechSynthesisUtterance interface of the Web Speech API](https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance).
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If `n` is even, return `n/2`. Otherwise, return `3n+1`.
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```js
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const speechSynthesis = message => {
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const msg = new SpeechSynthesisUtterance(message);
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msg.voice = window.speechSynthesis.getVoices()[0];
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window.speechSynthesis.speak(msg);
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};
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const collatz = n => (n % 2 == 0 ? n / 2 : 3 * n + 1);
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```
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<details>
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<summary>Examples</summary>
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```js
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speechSynthesis('Hello, World'); // // plays the message
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collatz(8); // 4
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```
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</details>
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@ -213,44 +260,6 @@ fibonacciUntilNum(10); // [ 0, 1, 1, 2, 3, 5, 8 ]
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<br>[⬆ Back to top](#table-of-contents)
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### howManyTimes
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Returns the number of times `num` can be divided by `divisor` (integer or fractional) without getting a fractional answer.
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Works for both negative and positive integers.
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If `divisor` is `-1` or `1` return `Infinity`.
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If `divisor` is `-0` or `0` return `0`.
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Otherwise, keep dividing `num` with `divisor` and incrementing `i`, while the result is an integer.
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Return the number of times the loop was executed, `i`.
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```js
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const howManyTimes = (num, divisor) => {
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if (divisor === 1 || divisor === -1) return Infinity;
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if (divisor === 0) return 0;
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let i = 0;
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while (Number.isInteger(num / divisor)) {
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i++;
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num = num / divisor;
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}
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return i;
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};
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```
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<details>
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<summary>Examples</summary>
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```js
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howManyTimes(100, 2); // 2
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howManyTimes(100, 2.5); // 2
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howManyTimes(100, 0); // 0
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howManyTimes(100, -1); // Infinity
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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### httpDelete
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Makes a `DELETE` request to the passed URL.
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@ -284,21 +293,36 @@ httpDelete('https://website.com/users/123', request => {
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<br>[⬆ Back to top](#table-of-contents)
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### collatz
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### httpPut
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Applies the Collatz algorithm.
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Makes a `PUT` request to the passed URL.
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If `n` is even, return `n/2`. Otherwise, return `3n+1`.
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Use `XMLHttpRequest` web api to make a `put` request to the given `url`.
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Set the value of an `HTTP` request header with `setRequestHeader` method.
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Handle the `onload` event, by running the provided `callback` function.
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Handle the `onerror` event, by running the provided `err` function.
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Omit the last argument, `err` to log the request to the console's error stream by default.
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```js
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const collatz = n => (n % 2 == 0 ? n / 2 : 3 * n + 1);
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const httpPut = (url, data, callback, err = console.error) => {
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const request = new XMLHttpRequest();
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request.open("PUT", url, true);
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request.setRequestHeader('Content-type','application/json; charset=utf-8');
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request.onload = () => callback(request);
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request.onerror = () => err(request);
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request.send(data);
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};
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```
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<details>
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<summary>Examples</summary>
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```js
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collatz(8); // 4
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const password = "fooBaz";
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const data = JSON.stringify(password);
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httpPut('https://website.com/users/123', data, request => {
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console.log(request.responseText);
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}); // 'Updates a user's password in database'
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```
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</details>
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@ -332,31 +356,6 @@ isArmstrongNumber(56); // false
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<br>[⬆ Back to top](#table-of-contents)
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### JSONToDate
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Converts a JSON object to a date.
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Use `Date()`, to convert dates in JSON format to readable format (`dd/mm/yyyy`).
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```js
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const JSONToDate = arr => {
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const dt = new Date(parseInt(arr.toString().substr(6)));
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return `${dt.getDate()}/${dt.getMonth() + 1}/${dt.getFullYear()}`;
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};
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```
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<details>
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<summary>Examples</summary>
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```js
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JSONToDate(/Date(1489525200000)/); // "14/3/2017"
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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### quickSort
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QuickSort an Array (ascending sort by default).
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@ -467,24 +466,26 @@ solveRPN('2 3 ^'); // 8
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<br>[⬆ Back to top](#table-of-contents)
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### httpPut
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### howManyTimes
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Makes a `PUT` request to the passed URL.
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Returns the number of times `num` can be divided by `divisor` (integer or fractional) without getting a fractional answer.
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Works for both negative and positive integers.
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Use `XMLHttpRequest` web api to make a `put` request to the given `url`.
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Set the value of an `HTTP` request header with `setRequestHeader` method.
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Handle the `onload` event, by running the provided `callback` function.
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Handle the `onerror` event, by running the provided `err` function.
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Omit the last argument, `err` to log the request to the console's error stream by default.
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If `divisor` is `-1` or `1` return `Infinity`.
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If `divisor` is `-0` or `0` return `0`.
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Otherwise, keep dividing `num` with `divisor` and incrementing `i`, while the result is an integer.
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Return the number of times the loop was executed, `i`.
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```js
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const httpPut = (url, data, callback, err = console.error) => {
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const request = new XMLHttpRequest();
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request.open("PUT", url, true);
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request.setRequestHeader('Content-type','application/json; charset=utf-8');
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request.onload = () => callback(request);
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request.onerror = () => err(request);
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request.send(data);
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const howManyTimes = (num, divisor) => {
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if (divisor === 1 || divisor === -1) return Infinity;
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if (divisor === 0) return 0;
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let i = 0;
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while (Number.isInteger(num / divisor)) {
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i++;
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num = num / divisor;
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}
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return i;
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};
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```
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@ -492,11 +493,10 @@ const httpPut = (url, data, callback, err = console.error) => {
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<summary>Examples</summary>
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```js
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const password = "fooBaz";
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const data = JSON.stringify(password);
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httpPut('https://website.com/users/123', data, request => {
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console.log(request.responseText);
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}); // 'Updates a user's password in database'
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howManyTimes(100, 2); // 2
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howManyTimes(100, 2.5); // 2
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howManyTimes(100, 0); // 0
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howManyTimes(100, -1); // Infinity
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```
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</details>
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