mcard-js
Version:
MCard - Content-addressable storage with cryptographic hashing, handle resolution, and vector search for Node.js and browsers
82 lines • 1.83 kB
JavaScript
/**
* Either Monad - Represents success (Right) or failure (Left)
*
* Used for error handling without exceptions
*/
export class Either {
_value;
_isLeft;
constructor(_value, _isLeft) {
this._value = _value;
this._isLeft = _isLeft;
}
/**
* Create a Left (failure/error)
*/
static left(value) {
return new Either(value, true);
}
/**
* Create a Right (success)
*/
static right(value) {
return new Either(value, false);
}
/**
* Check if Left
*/
get isLeft() {
return this._isLeft;
}
/**
* Check if Right
*/
get isRight() {
return !this._isLeft;
}
/**
* Get Left value (throws if Right)
*/
get left() {
if (!this._isLeft)
throw new Error('Cannot get left from Right');
return this._value;
}
/**
* Get Right value (throws if Left)
*/
get right() {
if (this._isLeft)
throw new Error('Cannot get right from Left');
return this._value;
}
/**
* Monadic bind - chain operations (short-circuits on Left)
*/
bind(fn) {
if (this._isLeft)
return Either.left(this._value);
return fn(this._value);
}
/**
* Map a function over Right value
*/
map(fn) {
if (this._isLeft)
return Either.left(this._value);
return Either.right(fn(this._value));
}
/**
* Get Right or default
*/
getOrElse(defaultValue) {
return this._isLeft ? defaultValue : this._value;
}
/**
* Fold: apply leftFn if Left, rightFn if Right
*/
fold(leftFn, rightFn) {
return this._isLeft ? leftFn(this._value) : rightFn(this._value);
}
}
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