if statement - Fast way to figure out if a number is inside a vector in R -

i hoping figure out fast way find out if number contained within vector purpose of passing if statement. far, best have come following:

a = 5 b = 1:10  if(length(which(a==5)) > 0){  #do something...  } 

i'm sure there faster way of doing this.

use %in%:

if (a %in% b) ... 

this may not faster you've got (since it's syntactic sugar match call) it's more compact , transparent.