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One line solution in Clear category for All the Same by dmnAlex
import assert from "assert";
var allTheSame = (elements: any[]): boolean => elements.reduce((a, b) => elements[0] === b && a, true)
console.log('Example:')
console.log(allTheSame([1, 1, 1]))
// These "asserts" are used for self-checking and not for an auto-testing
assert.equal(allTheSame([1, 1, 1]), true)
assert.equal(allTheSame([1, 2, 1]), false)
assert.equal(allTheSame(['a', 'a', 'a']), true)
assert.equal(allTheSame([]), true)
assert.equal(allTheSame([1]), true)
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Dec. 13, 2020