在scala中,您可以轻松地在字符串中包含变量的内容,如下所示:
val nm = "Arrr"
println(s"my name is , $nm")
这是否可能在nim中,在这种情况下,如何?
答案 0 :(得分:7)
strfmt module有一些实验string interpolation:
import strfmt
let nm = "Arrr"
echo interp"my name is $nm"
答案 1 :(得分:4)
添加您自己的string interpolation is not particularly had,因为标准库已经提供了大部分必要的部分:
import macros, parseutils, sequtils
macro i(text: string{lit}): expr =
var nodes: seq[PNimrodNode] = @[]
# Parse string literal into "stuff".
for k, v in text.strVal.interpolatedFragments:
if k == ikStr or k == ikDollar:
nodes.add(newLit(v))
else:
nodes.add(parseExpr("$(" & v & ")"))
# Fold individual nodes into a statement list.
result = newNimNode(nnkStmtList).add(
foldr(nodes, a.infix("&", b)))
const
multiplier = 3
message = i"$multiplier times 2.5 is ${multiplier * 2.5}"
echo message
# --> 3 times 2.5 is 7.5
proc blurb(a: int): string =
result = i"param a ($a) is not a constant"
when isMainModule:
for f in 1..10:
echo f.blurb
答案 2 :(得分:0)
strformat module 现在被认为是执行此操作的首选方法:
import strformat
let nm = "Arrr"
echo fmt"my name is , {nm}"