Joy is a purely functional language (produced by Manfred von Thun) based on the composition of functions.

Various introductions to Joy

• 🡥 Synopsis of the language Joy
• Frequently Asked Questions about Joy for programmers
• 🡥 Joy: Forth's Functional Cousin includes comparisons with Forth, presented by Reuben Thomas at the 17-th EuroForth Conference
• 🡥 Apter interviews von Thun in APL journal Vector
• Rationale for Joy, for theoretical computer scientists
• Overview of Joy, introductory sections of other papers.

You don't like theory? Try the tutorial.