[ANN] npm install remedial - Crockford's remedial.js

[AJ ONeal]

I just stuck Douglas Crockfords 'remedial.js'[1] on npm

npm install remedial

isEmpty - reliably tells you if an object or array is empyt
typeOf - reliably tells you the type of something
String.prototype.entityify -escapes "<" and ">" for html
String.prototype.quote -escapes quotes
String.prototype.supplant - templates out object names in {}

[1] http://javascript.crockford.com/remedial.html

AJ ONeal

[Tane Piper]

+1, good module to have in userland

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[Jorge]

a= Object.create( [] ); a[2]= 27; a

-> [ undefined, undefined, 27 ]

a.length

-> 0       // wtf ?

typeOf(a)  // the typeOf() function in remedial.js

-> 'array' // Sure ?

Any thoughts ?

-- 

Jorge.

[AJ ONeal]

a= Object.create( [] ); a[2]= 27; a

-> [ undefined, undefined, 27 ]

a.length

-> 0       // wtf ?

typeOf(a)  // the typeOf() function in remedial.js

-> 'array' // Sure ?

Any thoughts ?

Yes. My thought is that it's a perfect candidate for the WTFJS blog.

I did a little more testing in both Node and Firefox:
https://github.com/coolaj86/ssjs-remedial/blob/master/tests/array-wtf.js

If you use the `push()` method instead of `[x] = a` it then is seen as an object.

Would you expect it to be an array or an object?

[Jorge]

Fake arrays (Array-like objects) are not true arrays... so the test for array-ness in typeOf() is wrong :

function typeOf(value) {
  var s = typeof value;
  if (s === 'object') {
    if (value) {
      if (typeof value.length === 'number' &&
      !(value.propertyIsEnumerable('length')) &&
      typeof value.splice === 'function') {
        s = 'array';
      }
    } else {
      s = 'null';
    }
  }
  return s;
}

it should better be (IMO) the Miller Device http://bit.ly/cqIf0h :

function typeOf(value) {

  var s = typeof value;

  if (s === 'object') {

    if (value) {

      if ((/array/i).test(({}).toString.call(value))) {

        s = 'array';

      }

    } else {

      s = 'null';

    }

  }

  return s;

}

But that page (remedial.js) predates the discovery of the Miller device.

-- 

Jorge.

[Arnout Kazemier]

Node already exposes Array.isArray() so you might as well use that function instead. 

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Arnout Kazemier

in...@3rd-Eden.com

[Jorge]

On Nov 5, 11:03 pm, Arnout Kazemier <i...@3rd-eden.com> wrote:
> Node already exposes Array.isArray() so you might as well use that function instead.

I know, but "In the source code that follows, the priorities were
**portability** and compactness."
( http://javascript.crockford.com/remedial.html )

:-)

Cheers,
--
Jorge.

[Sami Samhuri]

Here's a slight variation of typeOf from cloudhead's eyes library:

function typeOf(value) {
var s = typeof(value),
types = ['Object', 'Array', 'String', 'RegExp', 'Number',
'Function', 'Boolean', 'Date'],
i;

if (s === 'object' || s === 'function') {
if (value) {
for (i = 0; i < types.length; ++i) {
if (({}).toString.call(value) === '[object ' +
types[i] + ']') {
s = types[i].toLowerCase();

}
}
} else { s = 'null' }
}
return s;
}

I think that's portable. Fairly compact. And unlike typeOf from
remedial it works on things like new String('foo').

-s

[Oleg Slobodskoi]

You should take a look at jquerys latest "type" implementation

https://github.com/jquery/jquery/blob/master/src/core.js

Line 498

regards,

Oleg

@oleg008

github.com/kof

2010/11/6 Sami Samhuri <sami.s...@gmail.com>

[Mark S. Miller]

Turns out that the discovery of the so-called "Miller device" predates my independent discovery of it, and thus of Crock's crediting me with it. It was first discovered by David Flanagan and appears in his "JavaScript: The Definitive Guide". It should be called the "Flanagan device". Please help hunt down and correct all these mis-attributions. Thanks.

 

--
    Cheers,
    --MarkM

[Sami Samhuri]

On Nov 6, 3:01 am, Oleg Slobodskoi <oleg...@googlemail.com> wrote:
> You should take a look at jquerys latest "type" implementation
>
> https://github.com/jquery/jquery/blob/master/src/core.js
>
> Line 498

More efficient, and readable. Thanks.

-s

[AJ ONeal]

I finally fixed this issue and republished on npm.

I stole the snippet from jQuery.type.

AJ ONeal

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