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@Evghenusi
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Created February 17, 2012 12:08
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inArray

140byt.es

A tweet-sized, fork-to-play, community-curated collection of JavaScript.

How to play

  1. Click the Fork button above to fork this gist.
  2. Modify all the files to according to the rules below.
  3. Save your entry and tweet it up!

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Rules

All entries must exist in an index.js file, whose contents are

  1. an assignable, valid Javascript expression that
  2. contains no more than 140 bytes, and
  3. does not leak to the global scope.

All entries must also be licensed under the WTFPL or equally permissive license.

For more information

See the 140byt.es site for a showcase of entries (built itself using 140-byte entries!), and follow @140bytes on Twitter.

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140byt.es is brought to you by Jed Schmidt, with help from Alex Kloss. It was inspired by work from Thomas Fuchs and Dustin Diaz.

Array.prototype.inArray = function (v)
{
return (this.indexOf ? this : (v = ',' + v + ',', ',' + this + ',')).indexOf(v) >= 0
}
Array.prototype.inArray=function(v){return(this.indexOf?this:(v=','+v+',',','+this+',')).indexOf(v)>=0}
Array.prototype.inArray=function(a,c){for(c in this)if(this[c]===a)return!0;return!1}
// author @williammalo
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2012 Evghenusi
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
{
"name": "inArray",
"description": "Checks if a value exists in an array",
"keywords": [
"array"
]
}
<!DOCTYPE html>
<title>Foo</title>
<script>
Array.prototype.inArray=function(v){return(this.indexOf?this:(v=','+v+',',','+this+',')).indexOf(v)>=0}
var arr = [1,2,3,5,6,7];
alert(arr.inArray(8));
alert(arr.inArray(6));
</script>
@atk
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atk commented Mar 26, 2012

Save variables: function(a,c){for(c in this)if(this[c]===a)return!0;return!1}

@williammalo
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@atk

I think that will always return false no matter what.

It actually works!

@atk
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atk commented Mar 26, 2012

x=function(a,c){for(c in this)if(this[c]===a)return!0;return!1} x.call([1,2,3,4],2) // -> true

nope, it doesn't. However, it could fail if you compare to some prototypical feature, like inArray (if you set it as prototype). To remedy for this, either use a numeric iteration or the hasOwnProperty-method; the latter has the advantage of being useful for Objects, too.

@Evghenusi
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function(a,b,c,d){for(;this[b=-~b]!=d;c=c||this[b]===a);return c}
4||6 bytes larger and probably slower))))

@atk
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atk commented Mar 26, 2012

Will fail on sparse arrays, e.g. [1,,3].

@Evghenusi
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persuaded, I give up

@atk
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atk commented Mar 27, 2012

You could still use function(a,b,c){for(;(b=-~b)in this;c=c||this[b]===a);return c}, but it's 2 bytes longer than my previous solution; but it doesn't suffer from inclusion of prototypic properties and is therefore the safest solution yet.

@Evghenusi
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@williammalo
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@atk
your function doesn't work if the number you test for is the first entry in the array
proof:
x=function(a,b,c){for(;(b=-~b)in this;c=c||this[b]===a);return c}​
document.write(x.call([2,3,4,5],2))​

@williammalo
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@atk
quick fix in 4 bytes:
function(a,b,c){for(b=-1;(b=-~b)in this;c=c||this[b]===a);return c}

@Evghenusi
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@williammalo, function(a,b,c){for(b=0;(b++)in this;c=c||this[b]===a);return c} ?

@williammalo
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@Evghenusi
it still has the same problem
proof:
x=function(a,b,c){for(b=0;(b++)in this;c=c||this[b]===a);return c}
document.write(x.call([2,3,4,5],2))
//returns false

@Evghenusi
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amusingly.


http://alokmenghrajani.github.com/tron/ 219 bytes tron

@maettig
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maettig commented Mar 27, 2012

What about this? 62 bytes. Seems to work in all cases except for sparse arrays.

function(a,b,c){for(b=-1;++b in this;c|=this[b]===a);return c}

@williammalo
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@maettig
Hawt stuff!
make it return boleans with 1 byte more:
function(a,b,c){for(b=-1;++b in this;c|=this[b]===a);return!!c}
and if you want to take the risk of using for-in:
function(a,b,c){for(b in this)c|=this[b]===a;return!!c}

@atk
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atk commented Mar 27, 2012

easy: function(a,b,c){for(b=0;b in this;c=c||this[b++]===a);return c}​

@williammalo
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@atk
It's funny, my edit of maettig's function is the exact same length as yours.

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