Search elements in a vector or list

Question

How to search elements in a vector or list?
What are the possible means of finding position of element in the list?

Answer 1

There are multiple functions and operators that can be used to search elements in list or vector.

A few of them are,

1. %in%  - returns TRUE/FALSE based on whether the element is found or not found.

Syntax: v1 %in% v2

2.  match()  - similar to %in% but in the form of a function. Match() returns a vector of the positions of (first) matches of its first argument in its second. 

Syntax: 

match(x, table, nomatch = NA_integer_, incomparables = NULL)

3.  is.element - is.element(x, y) is identical to x %in% y. 

syntax: 

is.element(x, y)