JavaScript array_count_values

Return the value as key and the frequency of that value in input as value

function array_count_values (array) {
    // Return the value as key and the frequency of that value in input as value  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/array_count_values    // +   original by: Ates Goral (http://magnetiq.com)
    // + namespaced by: Michael White (http://getsprink.com)
    // +      input by: sankai
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   input by: Shingo    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: array_count_values([ 3, 5, 3, "foo", "bar", "foo" ]);
    // *     returns 1: {3:2, 5:1, "foo":2, "bar":1}
    // *     example 2: array_count_values({ p1: 3, p2: 5, p3: 3, p4: "foo", p5: "bar", p6: "foo" });
    // *     returns 2: {3:2, 5:1, "foo":2, "bar":1}    // *     example 3: array_count_values([ true, 4.2, 42, "fubar" ]);
    // *     returns 3: {42:1, "fubar":1}
    var tmp_arr = {}, key = '', t = '';
    
    var __getType = function (obj) {        // Objects are php associative arrays.
        var t = typeof obj;
        t = t.toLowerCase();
        if (t === "object") {
            t = "array";        }
        return t;
    };
 
    var __countValue = function (value) {        switch (typeof(value)) {
            case "number":
                if (Math.floor(value) !== value) {
                    return;
                }                // Fall-through
            case "string":
                if (value in this && this.hasOwnProperty(value)) {
                    ++this[value];
                } else {                    this[value] = 1;
                }
        }
    };
        t = __getType(array);
    if (t === 'array') {
        for (key in array) {
            if (array.hasOwnProperty(key)) {
                __countValue.call(tmp_arr, array[key]);            }
        }
    } 
    return tmp_arr;
}

external links: original PHP docs | raw js source

Examples

» Example 1

Running

1	array_count_values([ 3, 5, 3, "foo", "bar", "foo" ]);

Should return

1	{3:2, 5:1, "foo":2, "bar":1}

» Example 2

Running

1	array_count_values({ p1: 3, p2: 5, p3: 3, p4: "foo", p5: "bar", p6: "foo" });

Should return

1	{3:2, 5:1, "foo":2, "bar":1}

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

php.js uses JsLint to help us keep our code consistent and prevent some common bugs.

Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have array_count_values goodness in JavaScript.

Ates Goral ( original )
Michael White ( namespaced )
sankai ( input )
Shingo ( input )
Kevin van Zonneveld ( improved )
Brett Zamir ( bugfixed )

Comments

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Use:

[CODE]
your_stuff('here');
[/CODE]

for proper code formatting
By submitting code here you are allowing us to use it in php.js hence dual licensing it under the MIT and GPL licenses

Brett Zamir
Apr 22nd

@Shingo: Thanks for the report! Fixed in Git (with some other clean-up): http://github.com/kvz/phpjs/raw/master/functions/array/array_count_values.js

Shingo
Apr 21st

Thanks but there is one problem. If my test array is like
[code]
arr=["constructor"];
[code]
It does not work.

Kevin van Zonneveld
3 Apr '09

@ J-R: I'm running the test code with no problems:
$ ./phpjstest.php array_count_values
array/array_count_values.js returns#1 OKAY
returns#2 OKAY
returns#3 OKAY

Could you provide the exact code that fails? What did you expect, and what did it return instead? That would help us fix the problem! Thx

J-R
25 Mar '09

Hi,
I am on firefox on a mac. This code doesn't seem to be working. I tried debugging it by putting alerts in the function. It looks ok except it doesn't return what I expect it to. I am using your example to try to produce the same result to no avail.

<script type='text/javascript'>

function array_count_values( array ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Ates Goral (http://magnetiq.com)
    // + namespaced by: Michael White (http://getsprink.com)
    // +      input by: sankai
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: array_count_values([ 3, 5, 3, "foo", "bar", "foo" ]);
    // *     returns 1: {3:2, 5:1, "foo":2, "bar":1}
    // *     example 2: array_count_values({ p1: 3, p2: 5, p3: 3, p4: "foo", p5: "bar", p6: "foo" });
    // *     returns 2: {3:2, 5:1, "foo":2, "bar":1}
    // *     example 3: array_count_values([ true, 4.2, 42, "fubar" ]);
    // *     returns 3: {42:1, "fubar":1}
 
    var tmp_arr = {}, key = '', t = '';
    
    var __getType = function(obj) {
        // Objects are php associative arrays.
        var t = typeof obj;
        t = t.toLowerCase();
        if (t == "object") {
            t = "array";
        }
        return t;
    }    
 
    var __countValue = function (value) {
        switch (typeof(value)) {
            case "number":
                if (Math.floor(value) != value) {
                    return;
                }
            case "string":
                if (value in this) {
                    ++this[value];
                } else {
                    this[value] = 1;
                }
        }
    };
    
    t = __getType(array);
    if (t == 'array') {
        for ( key in array ) {
            __countValue.call(tmp_arr, array[key]);
        }
    } 
    return tmp_arr;
}


function formValidator(){
	var tmpArray= [];
	tmpArray = array_count_values([ 3, 5, 3, "foo", "bar", "foo" ]);
	document.write(tmpArray[0]  + tmpArray[1]+ tmpArray[2]);
	document.write(tmpArray[3]  + tmpArray[4]+ tmpArray[5]);
//	document.write(tmpArray[0] + " " + tmpArray[1]+ " " + tmpArray[2] + " " + tmpArray[3]+ " " + tmpArray[4]+ " " + tmpArray[5]);
}

</script>

<form id="frmchoixronde1" name="frmchoixronde1"  method="POST" 
enctype="application/x-www-form-urlencoded" onsubmit='return formValidator()'>
<html><head><title>Page des poolers</title></head> <body>
<b>Entrez vos choix pour la premiere ronde</b>
</br><fieldset>

<b><label for="player_1" style="width:2em">1</label></b><input name="player_1" id="player_1" type="text" size="30"></br>
<b><label for="player_2" style="width:2em">2</label></b><input name="player_2" id="player_2" type="text" size="30"></br>
<b><label for="player_3" style="width:2em">3</label></b><input name="player_3" id="player_3" type="text" size="30"></br>

<b><label for="player_4" style="width:2em">4</label></b><input name="player_4" id="player_4" type="text" size="30"></br>
<b><label for="player_5" style="width:2em">5</label></b><input name="player_5" id="player_5" type="text" size="30"></br>
<b><label for="player_6" style="width:2em">6</label></b><input name="player_6" id="player_6" type="text" size="30"></br>
<input type="submit" name="submit" value="Soumettre vos choix">

</form>
</br> 
</body></html>

Kevin van Zonneveld
27 Aug '08

@ sankai: Thanks for pointing that out sankai! I've replaced the mozilla-only: forEach with a regular for loop. It should work fine now!

sankai
25 Aug '08

It seems because IE broswer don't support the mothod array.forEach().I search some solution from the google web.

http://developer.mozilla.org/En/Core_JavaScript_1.5_Reference:Global_Objects:Array:forEach

I try add the code before array_count_values()
[CODE="Javascript"]
if (!Array.prototype.forEach)
{
Array.prototype.forEach = function(fun /*, thisp*/)
{
var len = this.length;
if (typeof fun != "function")
throw new TypeError();

var thisp = arguments[1];
for (var i = 0; i < len; i++)
{
if (i in this)
fun.call(thisp, this[i], i, this);
}
};
}
[/CODE]

lol...It still can't work!!!

Orz..do you have any idea,sir?

sankai
25 Aug '08

It can't work well in IE!
The debug infomation is "Object don't support the attribute or method" in the code as
[CODE="Javascript"]
if (array instanceof Array) {
array.forEach(countValue, tmp_ar);
} else if (array instanceof Object) {
for ( key in array ) {
countValue.call(tmp_ar, array[key]);
}
}
[/CODE]

å›§rz..but,It's working very well in Firefox!!

vikas
6 May '08

it very nice

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