I have an array that has some values inside, and I wish to return another array that has the value grouped in to their own arrays.
So the result I am trying to achieve is something like this:
var arr = [1,1,2,2,2,3,3,4,4,4,4,5,6]
var groupedArr =[[1,1],[2,2,2],[3,3],[4,4,4,4],[5],[6]]
This proposal works with Array#reduce for sorted arrays.
var arr = [1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 6],
groupedArr = arr.reduce(function (r, a, i) {
if (!i || a !== r[r.length - 1][0]) {
return r.concat([[a]]);
}
r[r.length - 1].push(a);
return r;
}, []);
document.write('<pre>' + JSON.stringify(groupedArr, 0, 4) + '</pre>');Here you go. By the way, this works with unsorted array as well.
var arr = [1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 6]
var grpdArr = [];
while(arr.length > 0){
var item = arr[0];
grpdArr.push(arr.filter(function(val) {
return val === item;
}));
arr = arr.filter(function(val){return val!==item});
}
//console.log(arr, grpdArr);
Well this should do. Pretty straight forward.., You get the elements and then remove them.
With forEach and temporary array
var arr = [1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 6];
var temp = [];
var res = [];
arr.forEach(function(e) {
if (temp.slice(-1) == e) temp.push(e);
else {
temp = [e];
res.push(temp);
}
});
document.write(JSON.stringify(res));This may not be the most optimal version but should do. This also works for unsorted arrays.
function abc(arr) {
var newObj = new Object();
for (var i in arr) {
if (typeof newObj[arr[i]] == 'undefined') {
newObj[arr[i]] = new Array();
}
newObj[arr[i]].push(arr[i]);
}
var groupedArr = new Array();
for (i in newObj) {
groupedArr.push(newObj[i]);
}
return groupedArr;
}
console.log(abc([1, 1, 2, 2, 3, 3, 3, 4, 1]));This is the most straightforward in my mind:
var arr = [1,1,2,2,2,3,3,4,4,4,4,5,6];
var grouped = {};
var groupedArr = [];
//accumulate the values in an object, each key is an array
for (var i = 0; i < arr.length; i++) {
if (!grouped[arr[i]]) grouped[arr[i]] = [];
grouped[arr[i]].push(arr[i]);
}
//loop through all the keys in the object and push the arrays to the master array
var keys = Object.keys(grouped);
for (var i = 0; i < keys.length; i++) {
groupedArr.push(grouped[keys[i]]);
}
console.log(groupedArr);
I think you could use the code below:
var arr = [1,1,2,2,2,3,3,4,4,4,4,5,6]
var groupedArray = [];
var temp = arr.sort();
var tempArray = [arr[0]];
for(var i = 0; i < temp.length - 1; ++i){
if(temp[i] == temp[i + 1]){
tempArray.push(temp[i + 1]);
}else{
groupedArray.push(tempArray);
tempArray = [temp[i + 1]];
}
}
groupedArray.push(tempArray);
Now the groupedArray will contain the Result
