Filter and find in angular

Angular @ViewChild() error: Expected 2 arguments, but got 1

Angular 8 , ViewChild takes 2 parameters

@ViewChild(ChildDirective, {static: false}) Component

React Warning: flattenChildren(…): Encountered two children with the same key

Its issue with map.
Add  index with some constant value rather than using

 key={value.name + value.description}

key={'some-constant-value'+index}