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Make own type (object) type in javascript.

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  Make own type (object) type in javascript. jonas.thornvall@gmail.com - 2015-06-06 15:11 -0700
    Re: Make own type (object) type in javascript. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-07 00:57 +0100
      Re: Make own type (object) type in javascript. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-07 01:33 +0100
        Re: Make own type (object) type in javascript. jonas.thornvall@gmail.com - 2015-06-06 17:37 -0700
        Re: Make own type (object) type in javascript. jonas.thornvall@gmail.com - 2015-06-06 17:50 -0700
          Re: Make own type (object) type in javascript. jonas.thornvall@gmail.com - 2015-06-06 18:03 -0700
            Re: Make own type (object) type in javascript. jonas.thornvall@gmail.com - 2015-06-06 18:07 -0700
          Re: Make own type (object) type in javascript. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-07 10:19 +0100
            Re: Make own type (object) type in javascript. jonas.thornvall@gmail.com - 2015-06-07 04:09 -0700
      Re: Make own type (object) type in javascript. Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-06-07 02:40 +0200

#28005 — Make own type (object) type in javascript.

Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit that still can be treated as a numerical value that can be added and subtracted, without bit operations?

And if so can that type be stored within an array.

I am interested in make type dependent upon base used. So if base 256 would create an 8 bit type, allocated and used in array. 128 an 7 bit type and so on.

Is it possible?

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#28007

jonas.thornvall@gmail.com writes:

> Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
> that still can be treated as a numerical value that can be added and
> subtracted, without bit operations?

No.

<snip>
-- 
Ben.

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#28009

ram@zedat.fu-berlin.de (Stefan Ram) writes:

> Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
>>jonas.thornvall@gmail.com writes:
>>>Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
>>>that still can be treated as a numerical value that can be added and
>>>subtracted, without bit operations?
>>No.
>
>   An attempt at implementing an object »holding« 8 bit:

It seems unlikely that he meant can one store small whole numbers in
64-bit floating point variables.  He's been doing that for months
(years?).

<snip>
-- 
Ben.

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#28010

Den söndag 7 juni 2015 kl. 02:33:32 UTC+2 skrev Ben Bacarisse:
> ram@zedat.fu-berlin.de (Stefan Ram) writes:
> 
> > Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> >>jonas.thornvall@gmail.com writes:
> >>>Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
> >>>that still can be treated as a numerical value that can be added and
> >>>subtracted, without bit operations?
> >>No.
> >
> >   An attempt at implementing an object »holding« 8 bit:
> 
> It seems unlikely that he meant can one store small whole numbers in
> 64-bit floating point variables.  He's been doing that for months
> (years?).
> 
> <snip>
> -- 
> Ben.

You are correct Ben, i want a type holding just X bits depending upon the chosen base.

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#28013

Den söndag 7 juni 2015 kl. 02:33:32 UTC+2 skrev Ben Bacarisse:
> ram@zedat.fu-berlin.de (Stefan Ram) writes:
> 
> > Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> >>jonas.thornvall@gmail.com writes:
> >>>Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
> >>>that still can be treated as a numerical value that can be added and
> >>>subtracted, without bit operations?
> >>No.
> >
> >   An attempt at implementing an object »holding« 8 bit:
> 
> It seems unlikely that he meant can one store small whole numbers in
> 64-bit floating point variables.  He's been doing that for months
> (years?).
> 
> <snip>
> -- 
> Ben.

But what is this Ben?

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures

Typed Arrays are new to JavaScript with ECMAScript Edition 6 and present an array-like view of an underlying binary data buffer. The following table helps you to find the equivalent C data types:

TypedArray objects
Type 	Size 	Description 	Web IDL type 	Equivalent C type
Int8Array 	1 	8-bit twos complement signed integer 	byte 	int8_t
Uint8Array 	1 	8-bit unsigned integer 	octet 	uint8_t
Uint8ClampedArray 	1 	8-bit unsigned integer (clamped) 	octet 	uint8_t
Int16Array 	2 	16-bit twos complement signed integer 	short 	int16_t
Uint16Array 	2 	16-bit unsigned integer 	unsigned short 	uint16_t
Int32Array 	4 	32-bit twos complement signed integer 	long 	int32_t
Uint32Array 	4 	32-bit unsigned integer 	unsigned long 	uint32_t
Float32Array 	4 	32-bit IEEE floating point number 	unrestricted float 	float
Float64Array 	8 	64-bit IEEE floating point number 	unrestricted double 	double

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#28014

Den söndag 7 juni 2015 kl. 02:50:36 UTC+2 skrev jonas.t...@gmail.com:
> Den söndag 7 juni 2015 kl. 02:33:32 UTC+2 skrev Ben Bacarisse:
> > ram@zedat.fu-berlin.de (Stefan Ram) writes:
> > 
> > > Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> > >>jonas.thornvall@gmail.com writes:
> > >>>Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
> > >>>that still can be treated as a numerical value that can be added and
> > >>>subtracted, without bit operations?
> > >>No.
> > >
> > >   An attempt at implementing an object »holding« 8 bit:
> > 
> > It seems unlikely that he meant can one store small whole numbers in
> > 64-bit floating point variables.  He's been doing that for months
> > (years?).
> > 
> > <snip>
> > -- 
> > Ben.
> 
> But what is this Ben?
> 
> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures
> 
> Typed Arrays are new to JavaScript with ECMAScript Edition 6 and present an array-like view of an underlying binary data buffer. The following table helps you to find the equivalent C data types:
> 
> TypedArray objects
> Type 	Size 	Description 	Web IDL type 	Equivalent C type
> Int8Array 	1 	8-bit twos complement signed integer 	byte 	int8_t
> Uint8Array 	1 	8-bit unsigned integer 	octet 	uint8_t
> Uint8ClampedArray 	1 	8-bit unsigned integer (clamped) 	octet 	uint8_t
> Int16Array 	2 	16-bit twos complement signed integer 	short 	int16_t
> Uint16Array 	2 	16-bit unsigned integer 	unsigned short 	uint16_t
> Int32Array 	4 	32-bit twos complement signed integer 	long 	int32_t
> Uint32Array 	4 	32-bit unsigned integer 	unsigned long 	uint32_t
> Float32Array 	4 	32-bit IEEE floating point number 	unrestricted float 	float
> Float64Array 	8 	64-bit IEEE floating point number 	unrestricted double 	double

Is it not possible to make ones own view of the array data buffer, must one use the ones above?

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#28015

Den söndag 7 juni 2015 kl. 03:03:24 UTC+2 skrev jonas.t...@gmail.com:
> Den söndag 7 juni 2015 kl. 02:50:36 UTC+2 skrev jonas.t...@gmail.com:
> > Den söndag 7 juni 2015 kl. 02:33:32 UTC+2 skrev Ben Bacarisse:
> > > ram@zedat.fu-berlin.de (Stefan Ram) writes:
> > > 
> > > > Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> > > >>jonas.thornvall@gmail.com writes:
> > > >>>Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
> > > >>>that still can be treated as a numerical value that can be added and
> > > >>>subtracted, without bit operations?
> > > >>No.
> > > >
> > > >   An attempt at implementing an object »holding« 8 bit:
> > > 
> > > It seems unlikely that he meant can one store small whole numbers in
> > > 64-bit floating point variables.  He's been doing that for months
> > > (years?).
> > > 
> > > <snip>
> > > -- 
> > > Ben.
> > 
> > But what is this Ben?
> > 
> > https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures
> > 
> > Typed Arrays are new to JavaScript with ECMAScript Edition 6 and present an array-like view of an underlying binary data buffer. The following table helps you to find the equivalent C data types:
> > 
> > TypedArray objects
> > Type 	Size 	Description 	Web IDL type 	Equivalent C type
> > Int8Array 	1 	8-bit twos complement signed integer 	byte 	int8_t
> > Uint8Array 	1 	8-bit unsigned integer 	octet 	uint8_t
> > Uint8ClampedArray 	1 	8-bit unsigned integer (clamped) 	octet 	uint8_t
> > Int16Array 	2 	16-bit twos complement signed integer 	short 	int16_t
> > Uint16Array 	2 	16-bit unsigned integer 	unsigned short 	uint16_t
> > Int32Array 	4 	32-bit twos complement signed integer 	long 	int32_t
> > Uint32Array 	4 	32-bit unsigned integer 	unsigned long 	uint32_t
> > Float32Array 	4 	32-bit IEEE floating point number 	unrestricted float 	float
> > Float64Array 	8 	64-bit IEEE floating point number 	unrestricted double 	double
> 
> Is it not possible to make ones own view of the array data buffer, must one use the ones above?

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView

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#28020

jonas.thornvall@gmail.com writes:

> Den söndag 7 juni 2015 kl. 02:33:32 UTC+2 skrev Ben Bacarisse:
>> ram@zedat.fu-berlin.de (Stefan Ram) writes:
>> 
>> > Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
>> >>jonas.thornvall@gmail.com writes:
>> >>>Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
>> >>>that still can be treated as a numerical value that can be added and
>> >>>subtracted, without bit operations?
>> >>No.
>> >
>> >   An attempt at implementing an object »holding« 8 bit:
>> 
>> It seems unlikely that he meant can one store small whole numbers in
>> 64-bit floating point variables.  He's been doing that for months
>> (years?).
>> 
>> <snip>
>> -- 
>> Ben.
>
> But what is this Ben?
>
> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures

Can you rely on Edition 6?  I may have misunderstood your goal which I
took to be a request for minimal sized objects.  If you don't mind
wasting bits, there are lots of ways to do what you ask (see other
replies prompted by my "no" reply for some examples).  But these new
types only give you another kind of container into which to pack the
data -- they don't allow you to do anything you could not do otherwise.

<snip>
-- 
Ben.

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#28021

Den söndag 7 juni 2015 kl. 11:19:39 UTC+2 skrev Ben Bacarisse:
> jonas.thornvall@gmail.com writes:
> 
> > Den söndag 7 juni 2015 kl. 02:33:32 UTC+2 skrev Ben Bacarisse:
> >> ram@zedat.fu-berlin.de (Stefan Ram) writes:
> >> 
> >> > Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> >> >>jonas.thornvall@gmail.com writes:
> >> >>>Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
> >> >>>that still can be treated as a numerical value that can be added and
> >> >>>subtracted, without bit operations?
> >> >>No.
> >> >
> >> >   An attempt at implementing an object »holding« 8 bit:
> >> 
> >> It seems unlikely that he meant can one store small whole numbers in
> >> 64-bit floating point variables.  He's been doing that for months
> >> (years?).
> >> 
> >> <snip>
> >> -- 
> >> Ben.
> >
> > But what is this Ben?
> >
> > https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures
> 
> Can you rely on Edition 6?  I may have misunderstood your goal which I
> took to be a request for minimal sized objects.  If you don't mind
> wasting bits, there are lots of ways to do what you ask (see other
> replies prompted by my "no" reply for some examples).  But these new
> types only give you another kind of container into which to pack the
> data -- they don't allow you to do anything you could not do otherwise.
> 
> <snip>
> -- 
> Ben.

Well the best would of course be to allocate a byte space and tell how to read it out tuples of 1,2 or 3 and so on using an index doing the multiples finding the correct index. And i can not see why programming languages do not allow this since it see so easy to implement, in a language like C.

But i do not really understand hardware related stuff and reasons, for limitations upon implementations.

 

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#28012

Ben Bacarisse wrote:

> jonas.thornvall@gmail.com writes:
>> Is it possible to create an object holding holding 1 bit, 2 bit, 3 bit
>> that still can be treated as a numerical value that can be added and
>> subtracted, without bit operations?
> 
> No.

  var o = {
    valueOf: function () {
      return (+!!this.bit3) * 4 + (+!!this.bit2) * 2 + (+!!this.bit1);
    }
  };

  o.bit2 = 23;
  
  /* 42 */
  40 + o

  /* 23 */ 
  25 - o

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
Please do not cc me. / Bitte keine Kopien per E-Mail.

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