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Use binary search in getVisibleElements()

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fkaelberer 2014-12-26 17:43:13 +01:00 • committed by fkaelberer
parent a033b4bf3d
commit a78bb6b946
3 changed files with 100 additions and 17 deletions
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37
test/unit/ui_utils_spec.js Normal file
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* globals expect, it, describe, binarySearchFirstItem */
'use strict';
describe('ui_utils', function() {
describe('binary search', function() {
function isTrue(boolean) {
return boolean;
}
function isGreater3(number) {
return number > 3;
}
it('empty array', function() {
expect(binarySearchFirstItem([], isTrue)).toEqual(0);
});
it('single boolean entry', function() {
expect(binarySearchFirstItem([false], isTrue)).toEqual(1);
expect(binarySearchFirstItem([true], isTrue)).toEqual(0);
});
it('three boolean entries', function() {
expect(binarySearchFirstItem([true, true, true], isTrue)).toEqual(0);
expect(binarySearchFirstItem([false, true, true], isTrue)).toEqual(1);
expect(binarySearchFirstItem([false, false, true], isTrue)).toEqual(2);
expect(binarySearchFirstItem([false, false, false], isTrue)).toEqual(3);
});
it('three numeric entries', function() {
expect(binarySearchFirstItem([0, 1, 2], isGreater3)).toEqual(3);
expect(binarySearchFirstItem([2, 3, 4], isGreater3)).toEqual(2);
expect(binarySearchFirstItem([4, 5, 6], isGreater3)).toEqual(0);
});
});
});