<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>let exploration</title>
<script src="https://npmcdn.com/@reactivex/rxjs@5.0.0-beta.2/dist/global/Rx.umd.js"></script>
</head>
<body>
</body>
</html>
const myArray = [1,2,3,4,5];
const myObservableArray = Rx.Observable.fromArray(myArray);
const test = myObservableArray
.map(val => val + 1)
//this fails, let behaves differently than most operators
//val in this case is an observable
//.let(val => val + 2)
.subscribe(val => console.log('VALUE FROM ARRAY: ', val));
const letTest = myObservableArray
.map(val => val + 1)
//'let' me have the entire observable
.let(obs => obs.map(val => val + 2))
.subscribe(val => console.log('VALUE FROM ARRAY WITH let: ', val));
//let provides flexibility to add multiple operators to source observable then return
const letTestThree = myObservableArray
.map(val => val + 1)
.let(obs => obs
.map(val => val + 2)
//also, just return evens
.filter(val => val % 2 === 0)
)
.subscribe(val => console.log('let WITH MULTIPLE OPERATORS: ', val));
//pass in your own function to add operators to observable
const obsArrayPlusYourOperators = (yourAppliedOperators) => {
return myObservableArray
.map(val => val + 1)
.let(yourAppliedOperators)
};
const addTenThenTwenty = obs => obs.map(val => val + 10).map(val => val + 20);
const letTestFour = obsArrayPlusYourOperators(addTenThenTwenty)
.subscribe(val => console.log('let FROM FUNCTION:', val));
Output
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