Function sequenceMap

a element mapping function, similar to recordMap, except that it operates on Array indexes instead of string keys.

Example

import { assertEquals } from "jsr:@std/assert"

const vec3 = [1, 2, "halla"] as const

const vecc = sequenceMap<typeof vec3, [unknown, unknown, string], boolean>([
	(v) => v + 4 > 0 ? true : false,
	(v) => v + 3 > 100 ? true : false,
	(s) => s === "halla" ? "hello" : "un-greetful",
], vec3)

vecc satisfies (readonly [boolean, boolean, string])

assertEquals(vecc, [true, false, "hello"])
  • sequenceMap<
        A extends readonly unknown[],
        U extends
            { [K in string | number | symbol]: any } = {
            [K in string | number | symbol]: unknown
        },
        D extends unknown = unknown,
        F extends SequenceMapper<A, U, D> = SequenceMapper<A, U, D>,
    >(
        mapping_funcs: F,
        input_data: A,
    ): { [K in string | number | symbol]: ReturnType<F[K<K>]> }

    Type Parameters

    • A extends readonly unknown[]
    • U extends { [K in string | number | symbol]: any } = { [K in string | number | symbol]: unknown }
    • D extends unknown = unknown
    • F extends SequenceMapper<A, U, D> = SequenceMapper<A, U, D>

    Parameters

    • mapping_funcs: F
    • input_data: A

    Returns { [K in string | number | symbol]: ReturnType<F[K<K>]> }

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