A JavaScript equivalent of PHP’s array_count_values
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)
// + 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;
}
example
array_count_values([ 3, 5, 3, "foo", "bar", "foo" ]);
returns
{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" });
Should return
{3:2, 5:1, "foo":2, "bar":1}
Example 3
array_count_values([ true, 4.2, 42, "fubar" ]);
Should return
{42:1, "fubar":1}