Looking for help with organizing an Array:
var arr = ['a','a','b','b','b','c','d','d','a','a','a'];
I am aiming to achieve the following output:
[
['a','a'],
['b','b','b'],
['c'],
['d','d'],
['a','a','a'],
]
Note: The goal is to group only sequential repeated values, not all repeated values.
If anyone can assist me with this, I would greatly appreciate it!
A unique solution utilizing the power of Array.prototype.reduce() along with a reference to the previous element.
var arr = ['x', 'x', 'y', 'y', 'z', 'a', 'a', 'b', 'c', 'c', 'd'],
result = [];
arr.reduce(function (prev, current) {
if (current !== prev) {
result.push([]);
}
result[result.length - 1].push(current);
return current;
}, undefined);
document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');If you want to simplify your array, you can use the following approach:
var arr = ['a','a','b','b','b','c','d','d','a','a','a'];
var result = arr.reduce(function(r, i) {
if (typeof r.last === 'undefined' || r.last !== i) {
r.last = i;
r.arr.push([]);
}
r.arr[r.arr.length - 1].push(i);
return r;
}, {arr: []}).arr;
console.log(result);
For more information on how to use Array.prototype.reduce(), check out this link.
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