What are associative arrays? By what other names are they sometimes known? Why don’t most scripting languages provide direct support for records? What is a typeglob in Perl? What purpose does it...

What are associative arrays? By what other names are they sometimes known? Why don’t most scripting languages provide direct support for records? What is a typeglob in Perl? What purpose does it serve? Describe the tuple and set types of Python. Explain the unification of arrays and hashes in PHP and Tcl.