That comes despite the striker only being 17 years of age.
And Pardew feels it is Armstrong, not Papiss Cisse or Emmanuel Riviere, that he would most want to have in a one-on-one situation against an opposition goalkeeper.
“If we were in a situation where we’re one-on-one and it was anyone at the football club, I’d like it to be him," the Newcastle boss told reporters.
"That’s how confident I am in his finishing. He’s now got to get that game mentality. He will have learned a lot on Wednesday.
“He almost scored an unbelievable goal [against Palace], which he’s capable of. He’s highly rated by England at that level, under-18. We see enough in training to know the potential of this player.
“I’ve seen it before with Shelvey, who had at Charlton. Mark Noble, Chamberlain all at 17 and I put him in that category but he’s got to do what they did. They all progressed and he needs to.
“I think he’s kind of a player that can play in two roles. He can play at the top of the pitch and he can build the play because his touch is fantastic.”
The Magpies face Stoke City in their next Premier League action, on Monday night.