The Equality Operator ==

Relational operators, or comparators, are operators which help us see how one R object relates to another.

For example, you can check whether two objects are equal (equality) by using a double equals sign == .

We can see if the logical value of TRUE equals the logical value of TRUE by using this query TRUE == TRUE . The result of the equality query is a logical value ( TRUE or FALSE). In this case, it is TRUE because TRUE equals TRUE .

On the contrary, TRUE == FALSE will give us FALSE.

Apart from logical variables, we can also check the equality of other types, such as strings and numbers.

# Comparing the equality of two strings
"hello" == "goodbye"

# Comparing the equality of two numbers
3 == 2

Both of these output FALSE .

For you to try

The most basic form of comparison is equality. Recall that it is represented by the double equations syntax, ==. Here is an example of some equality statements:

3 == (2 + 1)
"ultimate guide" == "r"
TRUE == FALSE
"Rchitect" == "rchitect"

Notice from the last expression that R is case sensitive: “R” is not equal to “r”.

Try out the following comparisons:

• Write R code to see if TRUE equals FALSE .
• Check if -6 * 14 is equal to 17 — 101.
• See if the strings "useR" and "user" are equal in R.
• Find out what happens if you compare TRUE to the numeric 1.

Make sure not to mix up == (comparison) and = (assignment), == is what is used to check equality of R objects.

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