concatMapTo operator in RxJS

concatMapTo(innerObservable, resultSelector, outerIndex): OperatorFunctionresultSelector: optional parameter
OperatorFunction: A function that emits output as observable
const source = of( 1 , 2 , 3 );source.pipe(concatMapTo(interval( 1000 ).pipe(take( 3 )))).subscribe((val) => {console.log(val);});
// 0// 1// 2// 0// 1// 2// 0// 1// 2

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