it("last", function() {
assert.equal(util.last([1, 2, 3]), 3);
assert.deepEqual(util.last([1, 2, 3], 0), []);
assert.deepEqual(util.last([1, 2, 3], 2), [2, 3]);
assert.deepEqual(util.last([1, 2, 3], 5), [1, 2, 3]);
assert.equal(util.last(null), undefined);
assert.strictEqual(util.last([1, 2, 3], -1).length, 0);
});
it('clone', () => {
assert.equal(util.clone(100), 100);
var a = [100, 200];
var a1 = util.clone(a);
assert.notEqual(a, a1);
assert.deepEqual(a, a1);
a[0] = 150;
assert.notDeepEqual(a, a1);
var o = {
a: 100,
b: 200
};
var o1 = util.clone(o);
assert.notEqual(o, o1);
assert.deepEqual(o, o1);
o["a"] = 150;
assert.notDeepEqual(o, o1);
var moe = {
name: 'moe',
lucky: [13, 27, 34]
};
var clone = util.clone(moe);
assert.strictEqual(clone.name, 'moe', 'the clone as the attributes of the original');
clone.name = 'curly';
assert.ok(clone.name === 'curly' && moe.name === 'moe', 'clones can change shallow attributes without affecting the original');
clone.lucky.push(101);
assert.strictEqual(util.last(moe.lucky), 101, 'changes to deep attributes are shared with the original');
assert.strictEqual(util.clone(void 0), void 0, 'non objects should not be changed by clone');
assert.strictEqual(util.clone(1), 1, 'non objects should not be changed by clone');
assert.strictEqual(util.clone(null), null, 'non objects should not be changed by clone');
});
Viewport.prototype.zoomOut = function() {
this.zoom = util.last(zooms, It['<'](this.zoom), this.zoom)
}