dataprep/parse

Values

pub fn float(
  raw: String,
  on_error: fn(String) -> e,
) -> validated.Validated(Float, e)

Parse a string as Float. On failure, call on_error with the original string to produce the error value.

Accepts every shape gleam/float.parse accepts (e.g. "3.14", "-0.5") and additionally accepts:

integer literals — "5" parses as 5.0 (asymmetric strictness between parse.int and parse.float was a UX trap when the raw input is a user-typed numeric value).
scientific notation — "1e3", "1.5e-2", "5E3" are all accepted; the exponent must itself be a valid integer.

Example: parse.float(raw, fn(s) { NotAFloat(s) })

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pub fn int(
  raw: String,
  on_error: fn(String) -> e,
) -> validated.Validated(Int, e)

Parse a string as Int. On failure, call on_error with the original string to produce the error value.

Example: parse.int(raw, fn(s) { NotAnInteger(s) })