Selection sort

JavaScript, Algorithm, Array · Oct 13, 2021

Sorts an array of numbers, using the selection sort algorithm.

Use the spread operator (...) to clone the original array, arr.
Use a for loop to iterate over elements in the array.
Use Array.prototype.slice() and Array.prototype.reduce() to find the index of the minimum element in the subarray to the right of the current index. Perform a swap, if necessary.

const selectionSort = arr => {
  const a = [...arr];
  for (let i = 0; i < a.length; i++) {
    const min = a
      .slice(i + 1)
      .reduce((acc, val, j) => (val < a[acc] ? j + i + 1 : acc), i);
    if (min !== i) [a[i], a[min]] = [a[min], a[i]];
  }
  return a;
};

selectionSort([5, 1, 4, 2, 3]); // [1, 2, 3, 4, 5]

Written by Angelos Chalaris

I'm Angelos Chalaris, a JavaScript software engineer, based in Athens, Greece. The best snippets from my coding adventures are published here to help others learn to code.

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