Private interface methods are only supported starting with Android N (--min-api 24): void com.koushikdutta.async.future.Future.lambda$executorThread$0(com.koushikdutta.async.future.SimpleFuture) code example

Example 1: MatDatepicker: No provider found for DateAdapter. You must import one of the following modules at your application root: MatNativeDateModule, MatMomentDateModule, or provide a custom implementation

import {MatNativeDateModule} from '@angular/material';

Example 2: javascript check if is array

var colors=["red","green","blue"];

if(Array.isArray(colors)){
    //colors is an array
}