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Discussion on: 🧙‍♂️ 9 JavaScript Tips & Tricks To Code Like A Wizard

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Replies for: One that I often: const collection = [obj1, obj2, undefined, obj3, undefined]; const cleanCollection = collection.filter(Boolean); // [obj1, obj...

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Orkhan Jafarov • • Edited

Yep! That's nice one to work with array of primitives.
I had this small helper that export from helper file.

export const clearArray = value => {
  const types = {
    string: v => !!v,
    object: v => v && (
        Array.isArray(v) ? v : Object.keys(v)
    ).length,
    number: v => !Number.isNaN(v),
  }
  return types?.[typeof value]?.(value) ?? value;
};

and then import it and I put it as argument in the filter method.

import { clearArray } from './helpers';

const collection = [[], {}, "", null, undefined, NaN, "wee"];
const cleanCollection = collection.filter(clearArray);
//  ["wee"]