var arr = [1, 2, 3, 1, 5, 8, 2, 9, 9, 2, 2, 2, 3];
:
:1, 2, 3, 5, 8, 9
122532518192
~~~
var arr = [1, 2, 3, 1, 5, 8, 2, 9, 9, 2, 2, 2, 3];
:
:1, 2, 3, 5, 8, 9
122532518192
~~~ initialize the empty object, traverse the array, set the array member to the key of the object, initially value to 0, and then each key PP
var ret = arr.reduce(function(obj,val){
if(obj[val] != undefined){
obj[val] = obj[val] + 1;
}else{
obj[val] = 1;
}
return obj;
},{});
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