KindScript – A kinder JavaScript experience

Post by dchest » Sun, Mar 20, 2016, 4:12 PM UTC

amelius wrote: post #14

ankjevel wrote: post #13

Earlier quoted context omitted.

Why would you like to add anything to the __proto__ property? One way would be to write, like this: { const m = {} m.__alpha__ = 10 m.__bravo__ = 20 m.__defineGetter__('__proto__', () => 30) Reflect.ownKeys(m).forEach(key => console.log(key)) } EDIT: I can't format ...

To make my point clear, here is a question. What is wrong with the following function that counts the number of unique strings in a list of strings? function count_unique_strings(l) { var m = {}; l.forEach(function(s) { m[s] = true; }); var count = 0; for(var k in m) ++count; return count; } To see why this function is incorrect, run it with the following input: console.log(count_unique_strings(["alpha", "bravo", "br…

Post by coltonv » Sun, Mar 20, 2016, 4:20 PM UTC

fahimulhaq wrote: post #7

coltonv wrote: post #4

Looks like this wasn't ready to be revealed, like someone accidently made the repo public. The website is currently not public so I'm not going to try anything yet but as a co-foudner at an CS Ed-tech startup I'm going to keep my ears perked. MS has put out some really nice JS products recently.

Out of curiousity, what are you doing in CS Ed space?

Post by amelius » Sun, Mar 20, 2016, 5:04 PM UTC

joshuacc wrote: post #20

chowells wrote: post #17

Earlier quoted context omitted.

That solution doesn't cast javascript in a positive light. Why should you need to know that much about the guts of the language just to create an associative array that works properly?

JavaScript objects aren't associative arrays. They inherit property values from their prototype. Not just __proto__, but hasOwnProperty, etc. If you want to abuse objects in this way, it makes sense that you need a special approach to opt out of inheritance. A better approach is to just use Map. var m = new Map();

Post by pluma » Sun, Mar 20, 2016, 5:13 PM UTC

SeanDav wrote: post #8

Rather than simplify Javascript and protect beginners from themselves, why not start with a language that is both powerful and protective and yet easy to learn, like Pascal - learn the basics there in a more structured language? Lazarus is a free, cross platform IDE for Pascal and an excellent place to start: http://www.lazarus-ide.org/

Post by Jean-Philipe » Mon, Mar 21, 2016, 6:24 AM UTC

pluma wrote: post #27

SeanDav wrote: post #8

Rather than simplify Javascript and protect beginners from themselves, why not start with a language that is both powerful and protective and yet easy to learn, like Pascal - learn the basics there in a more structured language? Lazarus is a free, cross platform IDE for Pascal and an excellent place to start: http://www.lazarus-ide.org/

Pascal is a complete nightmare to start people off with if they are going to move on to a language like JavaScript, Python, Ruby, C# or Java. It's superficially similar but it has all kinds of archaic quirks and lacks basic affordances like return values or short-circuiting (i.e. in order to evaluate `a AND b` Pascal evaluates both). You might as well argue that beginners should start with Assembly. If you want to be…