ARM chips have an instruction with JavaScript in the name

Post by hajile » Tue, Oct 20, 2020, 3:03 PM UTC

sergeykish wrote: post #297

hajile wrote: post #295

Earlier quoted context omitted.

I completely agree that separate operators area MUST for dynamic languages. Lua allows operator overloading with metatables as do ruby and Python with classes http://lua-users.org/wiki/MetatableEvents https://docs.python.org/3/reference/datamodel.html#emulating... https://www.ruby-lang.org/en/documentation/faq/7/ > One number type in Lua: Not quite true. Lua had only 64-bit floats like JS until version 5.3 and the bl…

I have no grudge against operator overloading when done consciously — complex numbers, matrix multiplication. I've tried to implement JavaScript arithmetic in Ruby, failed so far. Sorry, I had to be clear, in Lua "one number type" means float, my bad. I meant Lua 5.3 integer still works like JavaScript Number. In the end we have to know about ToInteger, ToInt32, ToUint32, Number.MAX_SAFE_INTEGER [1]. It is not one nu…

Post by hajile » Tue, Oct 20, 2020, 3:35 PM UTC

sergeykish wrote: post #299

hajile wrote: post #289

Earlier quoted context omitted.

C++ has WAY more spec footguns than JS (and that's without counting all the C undefined behaviors which alone outweight all the warts of JS combined). PHP also beats out JS for warts (and outright bad implementation like left-to-right association of ternaries). Ruby has more than it's fair share of weirdness too (try explaining eigenclass interactions to a new ruby dev). Even python has weirdness like loops having an…

I have not claimed JS is the weirdest. But I have not claimed "Normally C++/PHP/Ruby/Python devs don't really encounter these notorious problems, for many years now" either. Eigenclass (singleton_class) explained in another thread. I have not encountered Pythons for/else [1] yet. Right, typeof null exposed by Microsoft IE 2 (?). Web is many times bigger now yet even such a small mistake is not fixed. I have issue + o…

    var foo = Object.create(null)
    //now foo.prototype and foo.__proto__ are both undefined
    foo.prototype = {abc:123}
    //foo.__proto__ is still undefined. Need to use Object.setPrototypeOf()

    var fn = function () {}
    fn.bar = "abc"

    Object.keys(fn) //=> ["bar"]

    //likewise
    (1).__proto__ === Number.prototype //=> true

Post by sergeykish » Tue, Oct 20, 2020, 5:40 PM UTC

hajile wrote: post #304

sergeykish wrote: post #299

Earlier quoted context omitted.

I have not claimed JS is the weirdest. But I have not claimed "Normally C++/PHP/Ruby/Python devs don't really encounter these notorious problems, for many years now" either. Eigenclass (singleton_class) explained in another thread. I have not encountered Pythons for/else [1] yet. Right, typeof null exposed by Microsoft IE 2 (?). Web is many times bigger now yet even such a small mistake is not fixed. I have issue + o…

`__proto__` doesn't necessarily equal `.prototype`. var foo = Object.create(null) //now foo.prototype and foo.__proto__ are both undefined foo.prototype = {abc:123} //foo.__proto__ is still undefined. Need to use Object.setPrototypeOf() In older JS code, I've seen people trying to abuse prototypes. One result in this kind of thing is often retaining references to those hidden `__proto__` leading to memory leaks. Also…

    var foo = {
      __proto__: null
    }
    foo.__proto__
    undefined

    Object.defineProperty(Object.prototype, "proto", {
      get() { Object.getPrototypeOf(this) }
    })

    typeof 1
    "number"
    1 instanceof Number
    false

    Number.prototype.foo = function () { return this }
    1..foo()
    //Number {1}
    typeof 1..foo()
    //"object"
    1..foo() instanceof Number 
    //true

    typeof Math.max
    "function"
    Math.max instanceof Function
    true
    Math.max instanceof Object 
    true

    delete Array.prototype.toString
    delete Object.prototype.toString
    Uncaught TypeError: Cannot convert object to primitive value

    delete Array.prototype.valueOf 
    delete Object.prototype.valueOf 
    +[]
    //0

Post by rhacker » Thu, Oct 22, 2020, 6:18 AM UTC

tachyonbeam wrote: post #29

rhacker wrote: post #19

It seems like every 2 months I feel the burn of JS not having more standard primitive types and choices for numbers. I get this urge to learn Rust or Swift or Go which lasts about 15 minutes... until I realize how tied up I am with JS. But I do think one day (might take a while) JS will no longer be the obvious choice for front-end browser development.

Are you saying you'd like to have specific int32, int64, float32, float64 types?

Post by OldHand2018 » Tue, Oct 27, 2020, 3:11 AM UTC

hajile wrote: post #303

OldHand2018 wrote: post #301

Earlier quoted context omitted.

I've never heard of that. If true, that might be a large hole in my theory :)

To quote David Kanter at Realworldtech > Poulson is fundamentally different and much more akin to traditional RISC or CISC microprocessors. Instructions, rather than explicitly parallel bundles, are dynamically scheduled and executed. Dependencies are resolved by flushing bad results and replaying instructions; no more global stalls. There is even a minimal degree of out-of-order execution – a profound repudiation of…