Could I please receive the arrangement ['H','H','A','A']
from the given input ['H','A','H','A']
Is there a way to organize it according to the first occurrence of each character?
Could I please receive the arrangement ['H','H','A','A']
from the given input ['H','A','H','A']
Is there a way to organize it according to the first occurrence of each character?
If you're looking to organize an array based on groupings, one approach is to utilize sorting with a mapping technique. By creating a temporary object with a hashtable for tracking group counters, you can effectively sort the elements based on their respective groups.
The sorting process is specifically tied to the groupings within the array.
Once sorted, the result is then mapped according to the index of the rearranged temporary array.
var array = ['H', 'A', 'H', 'A'],
groups = Object.create(null),
counter = 0,
result = array
.map((v, index) => ({ index, group: groups[v] = groups[v] || ++counter }))
.sort((a, b) => a.group - b.group)
.map(o => array[o.index]);
console.log(result);A similar concept can be achieved using a Map to maintain the order of the first occurrences.
var array = ['H', 'A', 'H', 'A'],
map = new Map;
array.forEach(v => map.has(v) || map.set(v, map.size + 1));
array.sort((a, b) => map.get(a) - map.get(b));
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