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38 lines
1010 B
38 lines
1010 B
// @flow strict-local
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import assert from 'assert';
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import {DefaultMap} from '../src/DefaultMap';
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describe('DefaultMap', () => {
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it('constructs with entries just like Map', () => {
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let map = new DefaultMap(k => k, [
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[1, 3],
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[2, 27],
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]);
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assert.equal(map.get(1), 3);
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assert.deepEqual(Array.from(map.entries()), [
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[1, 3],
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[2, 27],
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]);
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});
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it("returns a default value based on a key if it doesn't exist", () => {
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let map = new DefaultMap(k => k);
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assert.equal(map.get(3), 3);
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});
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it("sets a default value based on a key if it doesn't exist", () => {
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let map = new DefaultMap(k => k);
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map.get(3);
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assert.deepEqual(Array.from(map.entries()), [[3, 3]]);
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});
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it('respects undefined/null if it already existed in the map', () => {
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let map = new DefaultMap<number, number | void | null>(k => k);
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map.set(3, undefined);
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assert.equal(map.get(3), undefined);
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map.set(4, null);
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assert.equal(map.get(4), null);
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});
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});
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