Best resource I've found is a book called "Introduction to Functional Programming through Lambda Calculus": https://www.amazon.com/Introduction-Functional-Programming-C...

This is an excellent book from the pen and paper era, that is more than modern (functional programming is popular now): https://www.amazon.com/Introduction-Functional-Programming-C...

From my favorite author Anthony J. Dos Reis[0]

If you want to learn assembly language, computer architecture and C++ all at the same time: Assembly Language and Computer Architecture Using C++ and Java , Course Technology, 2004 [1]

If you want to learn how to write compilers, context free grammars, regular expressions and implement grep: Compiler Construction Using Java, JavaCC, and Yacc, IEEE/Wiley, 2012 [2]

If you want to learn functional programming, lambda calculus and LISP: An Introduction to Functional Programming Through Lambda Calculus by Greg Michaelson [3]

My programming skills had grown dramatically with this books. I would wholeheartedly recommend the books mentioned above for those who are interested to learn.

[0] - http://cs.newpaltz.edu/~dosreist/

[1] - https://www.amazon.com/Assembly-Language-Computer-Architectu...

[2] - https://www.amazon.com/Compiler-Construction-Using-Java-Java...

[3] - https://www.cs.rochester.edu/~brown/173/readings/LCBook.pdf - https://www.amazon.com/Introduction-Functional-Programming-C...

I would recommend [0] An Introduction to Functional Programming Through Lambda Calculus. This does not require any mathematical background, starting from simple substitution through list processing. This is a good opportunity to introduce lambda calculus since the child is interested. I mean it, lambda calculus would be a good start.

[0] - http://www.amazon.com/Introduction-Functional-Programming-Ca...

Any book on Lambda calculus http://www.amazon.com/Introduction-Functional-Programming-Ca...

https://www.edx.org/course/introduction-functional-programmi...! is a MOOC in Haskell