After creating this Observable:
const numbers$:Observable<any>=Observable.create((observer)=>{
for(let i=0;i<5;i++)
observer.next(i);
})
I attempted to use map and filter as shown below:
numbers$.pipe(map(x=>{x+110})).subscribe(x=>console.log(x)) //undefined
numbers$.map((x:any)=>{x*10}).subscribe(x=>console.log(x)) //undefined
However, both of these attempts resulted in undefined. Do you have any suggestions on how I can properly utilize this?
When using { and }, make sure to include a return statement.
numbers$.pipe(map(x=>{
return x+110
})).subscribe(x=>console.log(x))
Alternatively, you can simplify the code by removing the curly braces and return keyword.
numbers$.pipe(map(x=>x+110
)).subscribe(x=>console.log(x))
IMPORTANT: If you want to return an object without using return, remember to add extra parentheses.
numbers$.pipe(map(x=>({number:x+110})
)).subscribe(x=>console.log(x))
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