Notices tagged with javascript, page 16

yesterday, i took half a day to convert #javascript object to es2015 Map, for much more proper code. Today, i had to revert it back, cuz apparently lots browser still can't do Map. So i got more angry at these js "compilers" namely #TypeScript etc really fake compilers.

of course, the industry monkeys will say u should “polyfill”. fill them hindquarters. If u do, the import/require syntax is not even valid es2015 code. Dragging in complex fancy packagers. WTF is comp sci when u need it?

it's super annoying, that the #javascript compilers out there, including @typescriptlang @babeljs they do nothing to new functions such as Map/Set. So, they are not really compilers, just transform syntax.

understand #JavaScript Closure in 3 minutes
http://xahlee.info/js/javascript_closure.html

the utter confusion of of the concept “Operator” in Computer Languages
http://xahlee.info/comp/whats_operator_in_comp_lang.html
#JavaScript

#JavaScript tip:
clear array by
「ar.splice(0)」
better than 「ar=[]」
because the latter assingns a new value.
Is a problem if the variable is a constant.
JS: Array.prototype.splice
http://xahlee.info/js/js_array_splice.html

ask me question on patreon this weekend. emacs, #JavaScript, keyboard, or any tech stuff on my site.
https://www.patreon.com/posts/16282546

if you like my work, put money there. Thanks.

#JavaScript the JSON[Symbol.toStringTag] is interesting one, new in ES2015.
To understand it fully, see
http://xahlee.info/js/js_determine_object_type.html

here's my superb #JavaScript incarnation.
The BEST Unicode/Emoji Search on the web, period.
http://xahlee.info/comp/unicode_search.html

learn advanced #JavaScript .every() and .some()

Array.prototype.every
http://xahlee.info/js/js_array_every.html

Array.prototype.some
http://xahlee.info/js/js_Array.prototype.some.html

new #JavaScript insight. Do not use .every() or .some() for the purpose of loop with break, just cuz you like functional programing. In js, every and some semantics is loop anyway. But the syntax makes it 10 times harder to read.

more #JavaScript in Depth update:

Function.prototype
http://xahlee.info/js/js_Function_prototype_properties.html

Set an Object's Prototype
http://xahlee.info/js/js_set_objects_prototype.html

☯ ⚡ ∑ ♥ 😄.
Best unicode/emoji search there is.
http://xahlee.info/comp/unicode_index.html
Brand new sparkling #JavaScript code.

#JavaScript impossible to combine these into 1 line. Can you?
const unicodedata = {};
(data_str.split("\n")) . forEach ((x) => { ((y) => {unicodedata[ parseInt( y[0], 16 )] = y[1];}) (x.split(";")) });

#javascript in depth, understand the most confusing thing property key named "prototype" in 10 minutes
http://xahlee.info/js/javascript_object_prototype_property.html

#JavaScript #semicolonwar all over again. See @BrendanEich has to say. But Douglas Crockford will probably disagree.

https://twitter.com/xah_lee/status/951677715840512000

if you are not familiar with #javascript semicolon issues, see
http://xahlee.info/js/js_semicolon.html

#JavaScript In Depth update today.

Function.prototype.constructor
http://xahlee.info/js/js_Function.prototype.constructor.html

Set.prototype
http://xahlee.info/js/js_set_prototype.html

Set.prototype.values
http://xahlee.info/js/js_Set.prototype.values.html

To many programer idiots, when they learned about x = y or 3, they think, “omg, this is cool!”, cuz it is not intuitive and short, to them, they learned a fancy trick! And they proceed to tell everyone to use it as “idiom”. #python #JavaScript #haskell #lisp