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const $ = () => document.querySelector.call(this, arguments); const $$ = () => document.querySelectorAll.call(this, arguments); HTMLElement.prototype. 阅读全文
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Implement the util type OptionalUndefined<T, Props> that turns all the properties of T that can be undefined, into optional properties. In addition, a 阅读全文
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Given a number N, find the Nth triangular number, i.e. 1 + 2 + 3 + ... + N /* _____________ Your Code Here _____________ */ export type NumberToArray< 阅读全文
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Given 2 sets (unions), return its Cartesian product in a set of tuples, e.g. CartesianProduct<1 | 2, 'a' | 'b'> // [1, 'a'] | [2, 'a'] | [1, 'b'] | [2 阅读全文