Current File : /var/www/projetos/suporte.iigd.com.br/plugins/glpiinventory/lib/lazy.js-0.5.1/spec/memoize_spec.js
describe('memoize', function() {
it('only iterates as far as it needs', function() {
var visited = [];
var sequence = Lazy([1, 2, 3, 4, 5]).map(function(x) {
visited.push(x);
return x;
});
var memoized = sequence.memoize();
expect(memoized.get(0)).toEqual(1);
expect(visited).toEqual([1]);
expect(memoized.get(1)).toEqual(2);
expect(visited).toEqual([1, 2]);
expect(memoized.take(3)).toComprise([1, 2, 3]);
expect(visited).toEqual([1, 2, 3]);
// Ensure iterating over memoized again doesn't re-trigger side effects.
visited.length = 0;
expect(memoized.take(2)).toComprise([1, 2]);
expect(visited).toEqual([]);
// Reading one more from the sequence should result in 1 more side effect.
visited.length = 0;
expect(memoized.take(4)).toComprise([1, 2, 3, 4]);
expect(visited).toEqual([4]);
// Make sure actually iterating to the end doesn't cause any issues.
visited.length = 0;
expect(memoized).toComprise([1, 2, 3, 4, 5]);
expect(visited).toEqual([5]);
// Just for funsies.
visited.length = 0;
expect(memoized.map(Lazy.identity)).toComprise([1, 2, 3, 4, 5]);
expect(visited).toEqual([]);
});
it('works just fine on empty sequences', function() {
expect(Lazy([]).memoize()).toComprise([]);
});
it('works just fine on generated sequences', function() {
var numbers = Lazy.generate(Math.random).memoize().take(3);
});
});
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