I have the array ["oop", "poo", "oop", "kkd", "ddd", "kkd"].
Is there any elegant way I can split it to sub-arrays, so each array contains elements with same values?
I want to achieve the following
var arrayOne = ["oop", "oop"]
var arrayTwo = ["poo"]
var arrayThree = ["kkd", "kkd"]
var arrayFour = ["ddd"]
You could use reduce.
var arr = ["oop", "poo", "oop", "kkd", "ddd", "kkd"];
var mapped = arr.reduce((map, val)=>{
if(!map[val]) {
map[val]=[];
}
map[val].push(val);
return map;
}, {});
You can even get weird and make it a 1 liner, although probably not the brightest idea just in terms of clarity.
arr.reduce((m, v)=>(m[v]=m[v]||[]).push(v) && m, {});
You could maybe do something like this, but the requirement kinda feels like a code smell in the first place.
const mixedArray = ["oop", "poo", "oop", "kkd", "ddd", "kkd"];
const splitArrays = {};
mixedArray.forEach(v => {
if (!!splitArrays[v]) {
splitArrays[v].push(v);
} else {
splitArrays[v] = [v];
}
})
console.log(splitArrays);edit: If functional purity is a concern then ug_'s use of reduce is ipso facto preferable.
You can create a dictionary counting the values:
counter = {}
L = myArray.length
for (var i = 0; i < L; i++)
{
if (myArray[i] in counter)
{
counter[myArray[i]]+=1
}
else
{
counter[myArray[i]]=1
}
}
You could reduce and destructure
var arr = ["oop", "poo", "oop", "kkd", "ddd", "kkd"];
var obj = arr.reduce( (a,b) => (a[b] = a[b] + 1 || 1, a), {});
var [arrayOne, arrayTwo, arrayThree, arrayFour] = Object.keys(obj).map(k=>Array(obj[k]).fill(k));
console.log(arrayOne, arrayTwo, arrayThree, arrayFour);