CODEWITHSUNDEEP
rstring
Jonathan Rauscher
Jonathan Rauscher

Reputation: 157

R Passing a variable into an enclosed string

This may seem like a simple problem to solve, but it's beyond me. I have the following enclosed string

'{"foo":"bar","x":"<SOME VAR>"}'

I want to pass a variable into the place of <SOME VAR>. What would be the best way to achieve this? Any help is greatly appreciated.

Upvotes: 1

Views: 135

Answers (3)

sweetmusicality
sweetmusicality

Reputation: 937

(re-posting this as an answer as requested - glad to know it worked!)

can't you use gsub? 

string_name <- gsub(pattern = "<SOME VAR>", replacement = variable, x = string_name)

where string_name is the name of your example string

Upvotes: 2

Enrique P&#233;rez Herrero
Enrique P&#233;rez Herrero

Reputation: 3882

Your string is, in fact, a JSON object and thus you can use any JSON parser in R to convert your data to a data.frame, easy to manipulate.

library(jsonlite)

x <- '{"foo":"bar","x":"<SOME VAR>"}'
df <- fromJSON(x)
my_value <- "This is the value I want"
df$x <- my_value
df

#$foo
#[1] "bar"
#
#$x
#[1] "This is the value I want"

You can convert the data.frame again to JSON with:

toJSON(df, auto_unbox = TRUE)

Upvotes: 1

Niko
Niko

Reputation: 341

Can you store it as a list like:

a <- list("foo" = "bar", "x" = "<SOME VAR>")

If yes you could just fill it using the $operator:

a$x <- 3

Upvotes: 1

Related Questions