Condition

==,<,<=,>,>=,!= → boolean operators

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if/else

if(1>2){"large"}else{"small"}
ifelse(1>2,"large","small")

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switch → if not integer/index, must define result.

switch(1,"one","two","three")

out of condition return NULL

switch("d","a"="apple","b"="boy","c"="cat")

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for

for ( i in 1:3 ){ print(i) }

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while

i = 1
while ( i < 4 ) { print(i); i=i+1; }

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repeat

i = 1
repeat { print(i); i=i+1; if(i > 3) break; }