18 lines
458 B
JavaScript
18 lines
458 B
JavaScript
const expect = require('expect');
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const {memoize} = require('./_30s.js');
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test('memoize is a Function', () => {
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expect(memoize).toBeInstanceOf(Function);
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});
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const f = x => x * x;
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const square = memoize(f);
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test('Function works properly', () => {
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expect(square(2)).toBe(4);
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});
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test('Function works properly', () => {
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expect(square(3)).toBe(9);
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});
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test('Cache stores values', () => {
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expect(Array.from(square.cache)).toEqual([[2, 4], [3, 9]]);
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});
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