rswitch
v0.7.0
Published
The rswitch library provides a compact and flexible way to implement switch-like functionality in JavaScript. It allows you to define cases and their corresponding actions using an object literal syntax.
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rswitch
The rswitch
library provides a compact and flexible way to implement a switch-like functionality in TypeScript. It allows you to define cases and their corresponding actions using an object literal syntax.
Installation
Install the rswitch
library using npm:
npm install rswitch
Usage
The rswitch
function takes a key and an object containing cases and actions. It evaluates the key against the cases and returns the corresponding action.
Syntax
rswitch(key, casesObj, options);
key
: The value to evaluate against the cases.casesObj
: An object containing cases and their actions.options
: (Optional) An object to customize the behavior of the rswitch function.returnFn
(optional, default: false): If set tofalse
, therswitch
function will call actions that are functions and return their values. If set totrue
, the function will return the functions as is.
Example
import rswitch from "rswitch";
// const {rswitch} = require("rswitch") // commonjs
const result = rswitch(
"dev",
{
designer: "Designer",
"dev, web": "Developer",
"": () => {
console.log("Hello");
},
},
{
returnFn: true,
}
);
console.log(result);
// Output: Developer
In this example, the rswitch
function evaluates the key 'dev'
against the cases defined in casesObj
. Since it matches the case 'dev, web'
, the corresponding action 'Developer'
is returned and assigned to the result
variable. Finally, the value of result
is logged to the console.
Case Definitions
Cases are defined as key-value pairs in the casesObj
object.
- Single Case:
{ caseKey: action }
- Multiple Cases:
{ 'case1, case2, case3': action }
- Default Case:
{ '': action }
Actions can be any value or a function that returns a value. If the action is a function, and the
options
object hasreturnFn
set tofalse
, it is called, and the returned value is returned.
If no cases match the evaluated key, the rswitch
function checks for a default case. If a default case is defined, its corresponding action is performed. If no default case is defined or its action is not provided, undefined
is returned.
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