spsUtil (version 0.2.2.1)

notFalsy: Judgement of falsy value

Description

judge if an object is or not a falsy value. This includes: empty value, empty string `""`, `NULL`, `NA`, length of 0 and `FALSE` itself

Usage

notFalsy(x)
isFalsy(x)
emptyIsFalse(x)

Value

`NA`, `""`, `NULL`, `length(0)`, `nchar == 0` and `FALSE` will return `FALSE`, otherwise `TRUE` in `notFalsy` and the opposite in `isFalsy`

Arguments

x

any R object

Details

R does not have good built-in methods to judge falsy values and these kind of values often cause errors in `if` conditions, for example `if(NULL) 1 else 2` will cause error. So this function will be useful to handle this kind of situations: `if(notFalsy(NULL)) 1 else 2`.

1. not working on S4 class objects. 2. `isFalsy` is the reverse of `notFalsy`: `isFalsy(x)` = !`notFalsy(x)` 3. `emptyIsFalse` is the old name for `notFalsy`

Useful for if statement. Normal empty object in if will spawn error. Wrap the expression with `emptyIsFalse` can avoid this. See examples

Examples

notFalsy(NULL)
notFalsy(NA)
notFalsy("")
try(`if(NULL) "not empty" else "empty"`) # this will generate error
if(notFalsy(NULL)) "not falsy" else "falsy" # but this will work
# Similar for `NA`, `""`, `character(0)` and more
isFalsy(NULL)
isFalsy(NA)
isFalsy("")