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First solution in Clear category for [old] Non-unique Elements by flairplaya
"use strict";
function nonUniqueElements(data) {
return data.filter((e, i, a) => a.indexOf(e) !== a.lastIndexOf(e));
}
var assert = require('assert');
if (!global.is_checking) {
assert.deepEqual(nonUniqueElements([1, 2, 3, 1, 3]), [1, 3, 1, 3], "1st example");
assert.deepEqual(nonUniqueElements([1, 2, 3, 4, 5]), [], "2nd example");
assert.deepEqual(nonUniqueElements([5, 5, 5, 5, 5]), [5, 5, 5, 5, 5], "3rd example");
assert.deepEqual(nonUniqueElements([10, 9, 10, 10, 9, 8]), [10, 9, 10, 10, 9], "4th example");
console.log("Coding complete? Click 'Check' to review your tests and earn cool rewards!");
}
July 23, 2018
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