RxPY - Combining Operators

combine_latest

This operator will create a tuple, for the observable given as input.

Syntax

combine_latest(observable1,observable2,.....)

Parameters

Observable: An observable.

Return value

It returns an observable with the values from the source observable converted to a tuple.

Example

from rx import of, operators as op
from datetime import date
test = of(1,2,3,4,5,6)
test2 = of(11,12,13,14,15,16)
test3 = of(111,112,113,114,115,116)
sub1 = test.pipe(
   op.combine_latest(test2, test3)
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))

Output

E:\pyrx>python testrx.py
The value is (6, 16, 111)
The value is (6, 16, 112)
The value is (6, 16, 113)
The value is (6, 16, 114)
The value is (6, 16, 115)
The value is (6, 16, 116)

merge

This operator will merge given observables.

Syntax

merge(observable)

Parameters

Observable: an observable.

Return value

It will return an observable with one sequence from the given observables.

Example

from rx import of, operators as op
from datetime import date
test = of(1,2,3,4,5,6)
test2 = of(11,12,13,14,15,16)
sub1 = test.pipe(
   op.merge(test2)
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))

Output

E:\pyrx>python testrx.py
The value is 1
The value is 2
The value is 3
The value is 4
The value is 5
The value is 6
The value is 11
The value is 12
The value is 13
The value is 14
The value is 15
The value is 16

start_with

This operator will take in the given values, and add at the start of the source observable return back the full sequence.

Syntax

start_with(values)

Parameters

values: The values you want to prefix at the start.

Return value

It returns an observable with given values prefixed at the start followed by the values from the source observable.

Example

from rx import of, operators as op
from datetime import date
test = of(1,2,3,4,5,6)
sub1 = test.pipe(
   op.start_with(-2,-1,0)
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))xExample

Output

E:\pyrx>python testrx.py
The value is -2
The value is -1
The value is 0
The value is 1
The value is 2
The value is 3
The value is 4
The value is 5
The value is 6

zip

This operator returns an observable with values in a tuple form, which is formed by taking the first value of the given observable and so on.

Syntax

zip(observable1, observable2...)

Parameters

Observable: an observable

Return value

It returns an observable with values in tuple format.

Example

from rx import of, operators as op
from datetime import date
test = of(1,2,3,4,5,6)
test1 = of(4,8,12,16,20)
test2 = of(5,10,15,20,25)
sub1 = test.pipe(
   op.zip(test1, test2)
)
sub1.subscribe(lambda x: print("The value is {0}".format(x)))

Output

E:\pyrx>python testrx.py
The value is (1, 4, 5)
The value is (2, 8, 10)
The value is (3, 12, 15)
The value is (4, 16, 20)
The value is (5, 20, 25)
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