TCL was the chosen language of the company we worked for at the time. I tempted the author to join my team, and we collaborated on the book 'Docker in Practice'

TCL was the chosen language of the company we worked for at the time. I tempted the author to join my team, and we collaborated on the book 'Docker in Practice' while implementing Docker within that company 2013-2015, before we both left. TCL is an unreasonably effective language for certain use cases (the company we worked for were driven by extremely tight deadlines and high performance requirements (appserver written in pure C in late 90s, with call-outs to TCL for business logic). I haven't touched TCL since, though.