as_numeric: Test object for, or coerce to, numeric
In incadata: Recognize and Handle Data in Formats Used by Swedish Cancer Centers

as_numeric is essentially a wrapper to as.numeric except that objects of class factor are first coerced to character and then to numeric. is_numeric test if x is "somehow numeric" (see examples).

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as_numeric(x)

is_numeric(x)

`x`	object to be coerced or tested (and return a logical vector of the same length) or should it test the whole vector as one object and return a logical vector of length one. (`TRUE` by default).

df <- data.frame(v = c("46513", "45"))
class(df$v) # factor

# Note that
as.numeric(df$v) # 2 1
# but
as_numeric(df$v) # 46513    45

is_numeric(1) # TRUE
is_numeric("1") # TRUE
is_numeric(as.factor(1)) # TRUE
is_numeric(as.factor("khb")) # FALSE