Travis build: 670 [cron]
This commit is contained in:
30secondsofcode
@ -3,25 +3,30 @@
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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useful and interesting, didn't quite make it into the repository due to either having very specific use-cases or being outdated.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.
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## Table of Contents
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* [`JSONToDate`](#jsontodate)
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* [`speechSynthesis`](#speechsynthesis)
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* [`squareSum`](#squaresum)
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* [`binarySearch`](#binarysearch)
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* [`celsiusToFahrenheit`](#celsiustofahrenheit)
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* [`cleanObj`](#cleanobj)
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* [`collatz`](#collatz)
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* [`countVowels`](#countvowels)
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* [`factors`](#factors)
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* [`fahrenheitToCelsius`](#fahrenheittocelsius)
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* [`fibonacciCountUntilNum`](#fibonaccicountuntilnum)
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* [`fibonacciUntilNum`](#fibonacciuntilnum)
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* [`heronArea`](#heronarea)
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* [`httpDelete`](#httpdelete)
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* [`howManyTimes`](#howmanytimes)
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* [`httpPut`](#httpput)
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* [`isArmstrongNumber`](#isarmstrongnumber)
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* [`isSimilar`](#issimilar)
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* [`kmphToMph`](#kmphtomph)
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* [`levenshteinDistance`](#levenshteindistance)
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* [`mphToKmph`](#mphtokmph)
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* [`pipeLog`](#pipelog)
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* [`quickSort`](#quicksort)
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* [`removeVowels`](#removevowels)
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* [`solveRPN`](#solverpn)
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* [`howManyTimes`](#howmanytimes)
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* [`speechSynthesis`](#speechsynthesis)
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* [`httpDelete`](#httpdelete)
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---
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### JSONToDate
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@ -48,28 +53,21 @@ JSONToDate(/Date(1489525200000)/); // "14/3/2017"
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<br>[⬆ Back to top](#table-of-contents)
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### speechSynthesis
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### squareSum
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Performs speech synthesis (experimental).
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Squares each number in an array and then sums the results together.
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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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Use `Array.prototype.reduce()` in combination with `Math.pow()` to iterate over numbers and sum their squares into an accumulator.
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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 squareSum = (...args) => args.reduce((squareSum, number) => squareSum + Math.pow(number, 2), 0);
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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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squareSum(1, 2, 2); // 9
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```
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</details>
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@ -108,6 +106,27 @@ 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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### celsiusToFahrenheit
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Celsius to Fahrenheit temperature conversion.
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Follows the conversion formula `F = 1.8C + 32`.
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```js
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const celsiusToFahrenheit = degrees => 1.8 * degrees + 32;
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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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celsiusToFahrenheit(33) // 91.4
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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### cleanObj
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Removes any properties except the ones specified from a JSON object.
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@ -233,6 +252,27 @@ factors(-12, true); // [2,3]
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<br>[⬆ Back to top](#table-of-contents)
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### fahrenheitToCelsius
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Fahrenheit to Celsius temperature conversion.
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Follows the conversion formula `C = (F - 32) * 5/9`.
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```js
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const fahrenheitToCelsius = degrees => (degrees - 32) * 5/9;
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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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fahrenheitToCelsius(32); // 0
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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### fibonacciCountUntilNum
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Returns the number of fibonnacci numbers up to `num`(`0` and `num` inclusive).
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@ -311,22 +351,26 @@ heronArea(3, 4, 5); // 6
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<br>[⬆ Back to top](#table-of-contents)
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### httpDelete
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### howManyTimes
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Makes a `DELETE` 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 `delete` request to the given `url`.
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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 third 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 httpDelete = (url, callback, err = console.error) => {
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const request = new XMLHttpRequest();
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request.open('DELETE', url, true);
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request.onload = () => callback(request);
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request.onerror = () => err(request);
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request.send();
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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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@ -334,9 +378,10 @@ const httpDelete = (url, callback, err = console.error) => {
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<summary>Examples</summary>
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```js
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httpDelete('https://website.com/users/123', request => {
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console.log(request.responseText);
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}); // 'Deletes a user from the 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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@ -434,6 +479,28 @@ isSimilar('tr','Rohit'); // false
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<br>[⬆ Back to top](#table-of-contents)
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### kmphToMph
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Convert kilometers/hour to miles/hour.
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Multiply the constant of proportionality with the argument.
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```js
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const kmphToMph = (kmph) => 0.621371192 * kmph;
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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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kmphToMph(10); // 16.09344000614692
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kmphToMph(345.4); // 138.24264965280207
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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### levenshteinDistance
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Calculates the [Levenshtein distance](https://en.wikipedia.org/wiki/Levenshtein_distance) between two strings.
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@ -481,6 +548,28 @@ compareStrings('30-seconds-of-code', '30-seconds-of-python-code'); // 99.72 (%)
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<br>[⬆ Back to top](#table-of-contents)
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### mphToKmph
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Convert miles/hour to kilometers/hour.
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Multiply the constant of proportionality with the argument.
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```js
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const mphToKmph = (mph) => 1.6093440006146922 * mph;
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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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mphToKmph(10); // 16.09344000614692
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mphToKmph(85.9); // 138.24264965280207
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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### pipeLog
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Logs a value and returns it.
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@ -611,26 +700,20 @@ solveRPN('2 3 ^'); // 8
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<br>[⬆ Back to top](#table-of-contents)
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### howManyTimes
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### speechSynthesis
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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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Performs speech synthesis (experimental).
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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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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 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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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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@ -638,10 +721,39 @@ const howManyTimes = (num, divisor) => {
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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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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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### httpDelete
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Makes a `DELETE` request to the passed URL.
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Use `XMLHttpRequest` web api to make a `delete` request to the given `url`.
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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 third argument, `err` to log the request to the console's error stream by default.
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```js
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const httpDelete = (url, callback, err = console.error) => {
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const request = new XMLHttpRequest();
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request.open('DELETE', url, true);
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request.onload = () => callback(request);
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request.onerror = () => err(request);
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request.send();
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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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httpDelete('https://website.com/users/123', request => {
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console.log(request.responseText);
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}); // 'Deletes a user from the database'
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```
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</details>
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