13 lines
505 B
JavaScript
13 lines
505 B
JavaScript
const expect = require('expect');
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const {groupBy} = require('./_30s.js');
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test('groupBy is a Function', () => {
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expect(groupBy).toBeInstanceOf(Function);
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});
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test('Groups the elements of an array based on the given function', () => {
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expect(groupBy([6.1, 4.2, 6.3], Math.floor)).toEqual({ 4: [4.2], 6: [6.1, 6.3] });
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});
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test('Groups the elements of an array based on the given function', () => {
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expect(groupBy(['one', 'two', 'three'], 'length')).toEqual({ 3: ['one', 'two'], 5: ['three'] });
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});
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