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What is the difference between string and stringr in R?

AKASH BAJWA

Grokking Modern System Design Interview for Engineers & Managers

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What are strings?

Strings are a collection of various characters in the R language. These characters are enclosed in single or double quotation marks. Strings can also contain numbers, special characters, or spaces.

We must consider some rules when we construct strings in R:

  • Strings with single quotes can contain double-quoted strings and vice versa.
  • Double quoted strings cannot contain another double-quoted string.
  • Single quoted strings cannot contain another single-quoted string.
  • There should be a proper ending and closing for both single and double quotes when constructing strings.

Example 1

This example demonstrates the rules mentioned above.

# Properties of String Data Structure in R
str1 <- 'valid string 1'
print(str1)
str2 <- "another valid string"
print(str2)
str3 <- " we can also ' in double quotes "
print(str3)
str4 <- ' example of "valid" strings '
print(str4)
Strings Properties in R

Now, let’s discuss an example of some strings that are not allowed.

Example 2

A single quote is not allowed in line 4. A double quote within a double quote also produces Error: unexpected in line 7.

i1 <- 'not allowed"
print(i1)
i2 <- 'invalid' string'
print(i2)
i3 <- "it is also" not allowed"
print(i3)

What is stringr?

Stringr is a package in the R language that is used to perform fast manipulations on strings. Stringr contains all the relevant functions to perform string manipulation. Basically, strings are the combinations of various characters, and stringr is a package for performing manipulations on these character sequences.

Stringr package examples: Every function in this package will start with str_.

String length

You can get the size of a string or list of strings with the str_length() method. This method is equivalent to nchar(), which also returns the string’s length after the R.3.3.0 update.


str_length("abc")
str_length(c("strings", "length"))

Combining strings

str_c() helps to combine multiple strings; str_c() takes a vector of strings and collapses characters, i.e., comma. It returns the condensed string.


str_c(x, collapse = ", ")
str_c("what", "are", "strings?")

Subsetting strings

You can retrieve the part of strings through this function. We have to initialize the start and end when using this function.


a <- c("Black", "White", "Green")
str_sub(a,1,3)

RELATED TAGS

communitycreator
r language
stringr
strings

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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