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1. One-line group an Array by an Object... One-line group an Array by an Object Property - JavaScript ES2015, ES6

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   const groupBy = (arr, groupFn) => arr.reduce((grouped, obj) => ({...grouped,[groupFn(obj)]: [...(grouped[groupFn(obj)] || []), obj], }), {});

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   // Using it

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   const people = [

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     { name: 'Matt' },

2. 3x one-liner Shuffle Array - JavaScr... 3x one-liner Shuffle Array - JavaScript ES2015, ES6

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   // Original gist

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   const shuffleArray = arr => arr.sort(() => Math.random() - 0.5);

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   // Fully random by @BetonMAN

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   const shuffleArray = arr => arr.map(a => [Math.random(), a]).sort((a, b) => a[0] - b[0]).map(a => a[1]);