as | /object/index.ts | ayonli_jsext@v0.9.72

function as

import { as } from "https://deno.land/x/ayonli_jsext@v0.9.72/object/index.ts";

as(value: unknown, type: StringConstructor): string | null

Checks if the value is an instance of the given type, returns the value itself if passed, otherwise returns null. This function is mainly used for the optional chaining syntax.

as(value: unknown, type: NumberConstructor): number | null

as(value: unknown, type: BigIntConstructor): bigint | null

as(value: unknown, type: BooleanConstructor): boolean | null

as(value: unknown, type: SymbolConstructor): symbol | null

as<T>(value: unknown, type: Constructor<T>): T | null

Checks if the value is an instance of the given type, returns the value itself if passed, otherwise returns null. This function is mainly used for the optional chaining syntax.

Examples

Example 1

import { as } from "@ayonli/jsext/object";

try {
    // ... do something
} catch (err) {
    console.error(as(err, Error)?.message ?? String(err));
}

Type Parameters

Parameters

value: unknown

type: Constructor<T>

Returns

T | null