We'll first look at the
zip(Observable, Observable, <Observable>..., Func) operator, which can combine two or more
Observable instances using a combining function.
The function passed to the
zip operator has as many parameters as the number of the
Observable instances passed to the
zip() method. When all of these
Observable instances emit at least one item, the function is called with the parameter values first emitted by each of the
Observable instances. Its result will be the first emitted item by the
Observable instance created via the
zip() method. The second item emitted by this
Observable instance will be a combination (computed using the function parameter of the
zip() method) of the second items of the source
Observable instances. Even if one of the source
Observable instances has emitted three or more items, its second emitted item is used. The resulting
Observable instance always emits the same number of items as the source...