<E extends string>(options?: {
readonly separator?: string | undefined
}): Getter<ReadonlyArray<string>, E>Splits a string into an array of strings by a separator.
When to use
Use when you need a schema getter to split a present encoded string containing a delimited list, such as CSV values.
Details
The getter is pure and never fails. It splits by separator (default ,).
An empty string produces an empty array, not [""].
Example (Splitting a comma-separated string)
import { SchemaGetter } from "effect"
const splitComma = SchemaGetter.split<string>()
// "a,b,c" -> ["a", "b", "c"]
// "" -> []export function function split<
E extends string
>(options?: {
readonly separator?: string | undefined
}): Getter<ReadonlyArray<string>, E>
Splits a string into an array of strings by a separator.
When to use
Use when you need a schema getter to split a present encoded string
containing a delimited list, such as CSV values.
Details
The getter is pure and never fails. It splits by separator (default ,).
An empty string produces an empty array, not [""].
Example (Splitting a comma-separated string)
import { SchemaGetter } from "effect"
const splitComma = SchemaGetter.split<string>()
// "a,b,c" -> ["a", "b", "c"]
// "" -> []
split<function (type parameter) E in split<E extends string>(options?: {
readonly separator?: string | undefined;
}): Getter<ReadonlyArray<string>, E>
options: | {
readonly separator?: string | undefined
}
| undefined
separator?: string | undefinedseparator?: string | undefined
}): class Getter<out T, in E, R = never>class Getter {
run: (input: Option.Option<E>, options: SchemaAST.ParseOptions) => Effect.Effect<Option.Option<T>, SchemaIssue.Issue, R>;
map: <T2>(f: (t: T) => T2) => Getter<T2, E, R>;
compose: <T2, R2>(other: Getter<T2, T, R2>) => Getter<T2, E, R | R2>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
Represents a composable transformation from an encoded type E to a decoded type T.
When to use
Use when you need a schema getter to build and compose custom transformations
for Schema.decodeTo or Schema.decode.
Details
A getter wraps a function Option<E> -> Effect<Option<T>, Issue, R>. It
receives Option.None when the encoded key is absent, such as a missing
struct field, and returns Option.None to omit the value from the decoded
output. It fails with Issue on invalid input and may require Effect
services via R. .map(f) applies f to the decoded value inside Some
while leaving None unchanged. .compose(other) chains two getters by
feeding the output of this into other; passthrough getters on either side
are optimized away.
Example (Creating and composing getters)
import { SchemaGetter } from "effect"
const parseNumber = SchemaGetter.transform<number, string>((s) => Number(s))
const double = SchemaGetter.transform<number, number>((n) => n * 2)
const composed = parseNumber.compose(double)
// composed: Getter<number, string> — parses then doubles
Getter<interface ReadonlyArray<T>ReadonlyArray<string>, function (type parameter) E in split<E extends string>(options?: {
readonly separator?: string | undefined;
}): Getter<ReadonlyArray<string>, E>
const separator: stringseparator = options: | {
readonly separator?: string | undefined
}
| undefined
separator?: string | undefinedseparator ?? ","
return function transform<T, E>(
f: (e: E) => T
): Getter<T, E>
Creates a getter that applies a pure function to present values.
When to use
Use when you need a schema getter for a pure, infallible transformation
between types.
- Building encode/decode pairs for
Schema.decodeTo.
Details
- This is the most commonly used constructor.
- Transforms
Some(e) to Some(f(e)) and leaves None unchanged.
- Skips
None inputs — only called when a value is present.
- Never fails.
Example (Transforming strings to numbers)
import { Schema, SchemaGetter } from "effect"
const NumberFromString = Schema.String.pipe(
Schema.decodeTo(Schema.Number, {
decode: SchemaGetter.transform((s) => Number(s)),
encode: SchemaGetter.transform((n) => String(n))
})
)
transform((input: E extends stringinput) => input: E extends stringinput === "" ? [] : input: E extends stringinput.String.split(separator: string | RegExp, limit?: number): string[] (+1 overload)Split a string into substrings using the specified separator and return them as an array.
split(const separator: stringseparator))
}