Notices tagged with javascript, page 13

Meaning of “Object” in Computer Languages
http://xahlee.info/comp/meaning_of_object_in_computer_languages.html
#java #lisp #python #JavaScript #c

#JavaScript ES2015, learn how to Convert Object to/from Map.
http://xahlee.info/js/js_object_to_map_datatype.html

map object type is new. It replaces most use of object object.
And converting to/from object is the most important. There's no default function to do so.

#JavaScript in Depth, understand ES2015 Array.prototype.copyWithin
http://xahlee.info/js/js_Array.prototype.copyWithin.html

adaptive sampling in action

f_svg_plot(document.getElementById("plot1"),x=>[x,Math.sin(x*x)],[0,7,1.1],[-0.5,7.5],[-1.3,1.3],{"max_angle":f_degree_to_radian(5),"max_recursion_count":9});

http://xahlee.info/ee/test2018-02-07/parametric_plot.html
#JavaScript

took 3 hours, to debug.
if (vbx)
should be
if ( vbx !== null && vbx !== undefined )
fuck #JavaScript

#JavaScript In Depth, learn RegExp in 10 minutes, for beginner http://xahlee.info/js/js_regex_tutorial.html

i wonder if it is worthwhile, to create a new lang on top of #JavaScript, by writing a set of function wrappers that cover every (good) parts of js. And you code js using this wrapper layer.

you get minimal speed penalty, and is still pure js.

#JavaScript, understand Class like a Mathematician (updated)
http://xahlee.info/js/javascript_class.html

Web Design: say no to Grey Text on White Background
http://xahlee.info/js/web_design_gray_on_white.html
#JavaScript

#JavaScript understand the complexity of Array Constructor

• new Array(…) → same as Array(…)
• Array() → same as []
• Array(n) → if n is 0 or 1, 2 etc, same as y=[];y.length=n. Else, same as [x].
• Array(a1,a2,a3) → same as [a1,a2,a3]

Examples:
http://xahlee.info/js/js_array_constructor.html

#JavaScript in Depth today: Replace All Children, createDocumentFragment
http://xahlee.info/js/js_dom_createDocumentFragment.html

in #JavaScript, does inserting element in middle of array more expensive that adding to front or end? how much more expensive?

get #JavaScript in Depth
http://xahlee.info/js/buy_xah_js_tutorial.html

• In depth. Based on lang spec.
• Code example for every paragraph.
• Covers ES2015+.
• No framework/lib, no tricks, no idioms.
• Written in simple style. Anyone can understand.
• No ninja zen jargon injection. No joke.

find out your screen resolution size
http://xahlee.info/js/js_viewport_dimension.html
#javascript

#JavaScript today: Understand Prototype and Inheritance in Depth
http://xahlee.info/js/js_object_prototype_inheritance.html

#JavaScript learn how to write a SVG Clock in 30 minutes
http://xahlee.info/js/svg_clock.html

#JavaScript learn ECMAScript 2015 Features in 10 minutes
http://xahlee.info/js/js_ECMAScript_2015_features.html

#JavaScript question. With pure and vanilla ES2015, when writing a lib, does it still make sense to export just 1 name? that is, the whole lib looks like mylib = {/* [ lots functions here ] */}. Am guessing, with import/export, we no longer need single object structure?

#JavaScript understand ES2015 Class in Depth in 10 minutes
http://xahlee.info/js/javascript_class.html

#JavaScript
does anyone know why “defer” in
<script defer>console.log ( 3 );</script>
is ignored?
I want to know the reason given by whatwg or js standard body.