Fold折叠：化简的一种特殊情况，foldRight()：右折叠，foldLeft()左折叠override /*TraversableLike*/
def foldLeft[B](z: B)(f: (B, A) => B): B = {
var acc = z
var these = this
while (!these.isEmpty) {
acc
vim折叠python代码 Recently I was working on some C# and Java code. And along the way, I used Python and Vim to (re)write my code. A small Python script and a 6-keystroke Vim macro did it faster and bette
