jekyll: 3.9.3
liquid: 4.0.4
list = ['a','b','c','d']
list: ["a","b","c","d"]
list = list | push: 'y'
list: ["a","b","c","d","y"]
list = list | unshift: 'x'
list: ["x","a","b","c","d","y"]
list = list | pop
list: ["x","a","b","c","d"]
list = list | shift
list: ["a","b","c","d"]
list.first; list.last
list.first: "a"
list.last: "d"
list1 = ['Seattle', 'Tacoma', 'Spokane']
list1: ["Seattle","Tacoma"]
list1 | push: "Spokane"
unshift: ["Seattle","Tacoma","Spokane"]
list1 | pop
pop: ["Seattle"]
list1 | shift
shift: ["Tacoma"]
list1 | unshift: "Olympia"
unshift: ["Olympia","Seattle","Tacoma"]
