Ref:
- http://codenugget.co/2015/03/05/declarative-vs-imperative-programming-web.html main reference
- https://www.netguru.co/blog/imperative-vs-declarative having slide is good
- https://teamtreehouse.com/community/declarative-vs-imperative-vs-procedural-programming no example, but answer is good
- http://latentflip.com/imperative-vs-declarative/
Haven't read carefully:
- http://prog.vub.ac.be/~cderoove/declarative_programming/#material
- http://wiki.tcl.tk/13970
- https://existentialtype.wordpress.com/2013/07/18/what-if-anything-is-a-declarative-language/
- http://michaelfeathers.typepad.com/michael_feathers_blog/2013/11/unconditional-programming.html
- http://haacked.com/archive/2013/11/08/death-to-the-if-statement.aspx/
- http://www.i-programmer.info/programming/theory/1233-programming-paradigms-for-languages.html