time pre/post in swift

join.swift

var ints: [String] = []

for i in 0...10000 {
    ints.append(String(i))
}

var str = "start " + ints.joined(separator:" ")

print(str)

output

$ ./time-it.sh

real	0m0.091s
user	0m0.060s
sys	0m0.024s

real	0m0.080s
user	0m0.048s
sys	0m0.018s

real	0m0.083s
user	0m0.062s
sys	0m0.018s

post-mut.swift

var str = "start"
var i = 0;

for i in 0...10000 {
    str.append(" " +  String(i))
}

print(str)

post.swift

var str = "start"
var i = 0;

for i in 0...10000 {
    str  = str + " " +  String(i)
}

print(str)

pre.swift

var str = "start"
var i = 0;

for i in 0...10000 {
    str  =  String(i) + " " + str 
}

print(str)

time-it.sh

time swift pre.swift > NUL
time swift post.swift > NUL
time swift join.swift > NUL
time swift post-mut.swift > NUL