Function select

select<T, R>(project: UnaryFunction<T, R>): OperatorFunction<T, R>
A mapping operator that only emits when the next value changes

Returns
an observable which value will be the return value of the projection function
Type Parameters
- T
- R
Parameters
- project: UnaryFunction<T, R>
  
  a projection function (value: T) => R
Returns OperatorFunction<T, R>
- Defined in lib/operators/select.operator.ts:9

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