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First solution in Clear category for Sort Array by Element Frequency by ibonyun
import assert from "assert";
function frequencySort(items: any[]): any[] {
let counter = new Map()
for (let item of items) {
if (counter.has(item)) {
let itemArray = counter.get(item)
itemArray.push(item)
} else {
counter.set(item, [item])
}
}
return [...counter.values()].sort((a, b) => b.length - a.length).flat()
}
console.log('Example:');
console.log(frequencySort([4, 6, 2, 2, 6, 4, 4, 4]));
// These "asserts" are used for self-checking and not for an auto-testing
assert.deepEqual(frequencySort([4, 6, 2, 2, 6, 4, 4, 4]), [4, 4, 4, 4, 6, 6, 2, 2]);
assert.deepEqual(frequencySort(['bob', 'bob', 'carl', 'alex', 'bob']), ['bob', 'bob', 'bob', 'carl', 'alex']);
assert.deepEqual(frequencySort([17, 99, 42]), [17, 99, 42]);
assert.deepEqual(frequencySort([]), []);
assert.deepEqual(frequencySort([1]), [1]);
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July 9, 2021