DEV Community: NesNes

Babel (transcompiler)

NesNes — Thu, 13 Oct 2022 18:27:51 +0000

The transpiler Babel currently has the best coverage in terms of new language features. You can use it for all your real world programming needs without a problem.

https://en.owl.institute/my-account/my-courses/363602/947713/appendix-a-language-versions-and-transpilers-from-js-to-js#toc_ref_24.3

Babel is a free and open-source JavaScript transcompiler that is mainly used to convert ECMAScript 2015+ (ES6+) code into backwards-compatible JavaScript code that can be run by older JavaScript engines. It allows web developers to take advantage of the newest features of the language.[4]

Developers can use new JavaScript language features by using Babel to convert their source code into versions of JavaScript that a Web browser can process.[5] Babel is used to compile TypeScript into JavaScript.[6] The core version of Babel was downloaded 5 million times a month in 2016, and this increased to 16 million times a week in 2019.[7][8]

Babel plugins transform syntax that is not widely supported into a backward-compatible version. For example, arrow functions, which are specified in ES6, are converted into regular function declarations.[9] Non-standard JavaScript syntax such as JSX can also be transformed.[10][11]

Babel can automatically inject polyfills provided by core-js[12] for support features that are missing entirely from JavaScript environments. For example, static methods such as Array.from and built-ins such as Promise are available only in ES6 and above, but they can be used in older environments if core-js is used.

https://en.wikipedia.org/wiki/Babel_(transcompiler)

https://babeljs.io/

JS Arithmetic Operators

NesNes — Thu, 13 Oct 2022 18:20:00 +0000

JavaScript Arithmetic Operators

https://www.w3schools.com/js/js_arithmetic.asp

https://en.owl.institute/my-account/my-courses/363602/947713/operators-data-types-and-other-priorities-javascript-as-a-pocket-calculator-arithmetic-operators#toc_ref_3.2

https://en.owl.institute/my-account/my-courses/363602/947713/type-conversion-and-numbers-which-aren-t-numbers#toc_ref_7.1

API, Array-API

NesNes — Thu, 13 Oct 2022 18:11:20 +0000

https://en.owl.institute/my-account/my-courses/363602/947713/one-for-all-and-all-for-one-arrays-keeping-things-neat-and-tidy-using-sort#toc_ref_15.7

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array?retiredLocale=de

https://www.w3schools.com/jsref/jsref_obj_array.asp

API, String-API

NesNes — Thu, 13 Oct 2022 18:00:40 +0000

(...)the JS String API provides you with a few functions(...)

https://en.owl.institute/my-account/my-courses/363602/947713/a-veritable-string-potpourri#toc_ref_12

Strings are useful for holding data that can be represented in text form. Some of the most-used operations on strings are to check their length, to build and concatenate them using the + and += string operators, checking for the existence or location of substrings with the indexOf() method, or extracting substrings with the substring() method.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String?retiredLocale=de

https://developer.mozilla.org/en-US/docs/Learn/JavaScript/First_steps/Useful_string_methods

String-API functions:

charAt
includes
startsWith
endsWith -indexOf
lastIndexOf
repeat
substr
toLowerCase
trim

https://en.owl.institute/my-account/my-courses/363602/947713/a-veritable-string-potpourri-reference#toc_ref_12.7

API, Math-API

NesNes — Thu, 13 Oct 2022 17:50:19 +0000

JS developers will often also refer to this object as the Math API. You can think of an API (application programming interface) as a human-machine interface which allows a programmer to access the functionality essential for developing software. Depending on the given situation, this functionality can involve definitions, protocols, etc. In JS, an API generally refers to a set of functions which all relate to a specific topic. For example, the Math API allows you to access all the mathematical functionality available in JS.

https://en.owl.institute/my-account/my-courses/363602/947713/math-because-the-whole-is-greater-than-the-sum-of-its-parts#toc_ref_8.1

"Not a number is a number."

NesNes — Sat, 08 Oct 2022 10:36:44 +0000

In mathematics, zero divided by zero is undefined and is therefore represented by NaN in computing systems. The square root of a negative number is not a real number, and is therefore also represented by NaN in compliant computing systems. NaNs may also be used to represent missing values in computations.

Source: https://en.wikipedia.org/wiki/NaN

Why is the data type of "10" / "Hallo" a number?

NesNes — Sat, 08 Oct 2022 10:23:09 +0000

Markdown Course on Scrimba

NesNes — Fri, 07 Oct 2022 18:51:24 +0000

I am doing the Markdown course on Scrimba right now.

Markdown allows us to write HTML in a quick and fluid way.
We use this on the regular for our code reviews, comment sections and README files again and again.