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Compare the ES6 spread operator with the traditional slice() method

Compare the ES6 spread operator with the traditional slice() method

Compare the new ES6 spread operator with the traditional concat() method

[1,2, 3, 4, 5].indexOf(4) !== -1 [1,2, 3, 4, 5].filter(a=> a ===4).length > 0 [1,2, 3, 4, 5].find(a => a === 4) !== undefined [1,2, 3, 4, 5].some( a => a === 4) ![1,2, 3, 4, 5].every( a => a !== 4) [1,2, 3, 4, 5].lastIndexOf(4) !== -1 [1,2, 3, 4, 5].includes(4)

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