One-lines

Just a collection of JavaScript one-line tips.

• How to Capitalize Text

  const capitalize = (str) => `${str.charAt(0).toUpperCase()}${str.slice(1)}`;

• How to Calculate Percent

  const calculatePercent = (value, total) => Math.round((value / total) * 100)

• How to Get a Random Element

  const getRandomItem = (items) =>  items[Math.floor(Math.random() * items.length)];

• How to Remove Duplicate Elements

  const removeDuplicates = (arr) => [...new Set(arr)];

• How to Sort Elements By Certain Property

  const sortBy = (arr, key) => arr.sort((a, b) => a[key] > b[key] ? 1 : a[key] < b[key] ? -1 : 0);

• How to Check if Arrays/Objects are Equal

  const isEqual = (a, b) => JSON.stringify(a) === JSON.stringify(b);

• How to Count Number of Occurrences

  const countOccurrences = (arr, value) => arr.reduce((a, v) => (v === value ? a + 1 : a), 0);

• How to Wait for a Certain Amount of Time

  const wait = async (milliseconds) => new Promise((resolve) => setTimeout(resolve, milliseconds));

• How to Use the Pluck Property from Array of Objects

  const pluck = (objs, key) => objs.map((obj) => obj[key]);

• How to Insert an Element at a Certain Position

  const insert = (arr, index, newItem) => [...arr.slice(0, index), newItem, ...arr.slice(index)];

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Reference

https://www.freecodecamp.org/news/javascript-one-liners-to-use-in-every-project/