♻️ refactor: Remove empty Digit base class.

Author: make-github-pseudonymous-again

src/0-core/split/DigitSplit.js

@@ -1,16 +1,31 @@
 import assert from 'assert';
-import {Digit} from '../../1-digit/0-Digit.js';
+import {One} from '../../1-digit/1-One.js';
+import {Two} from '../../1-digit/2-Two.js';
+import {Three} from '../../1-digit/3-Three.js';
+import {Four} from '../../1-digit/4-Four.js';
 
 /**
  * DigitSplit.
  *
- * @param {Digit} left
+ * @param {null|One|Two|Three|Four} left
  * @param {any} middle
- * @param {Digit} right
+ * @param {null|One|Two|Three|Four} right
  */
 export function DigitSplit(left, middle, right) {
-	assert(left === null || left instanceof Digit);
-	assert(right === null || right instanceof Digit);
+	assert(
+		left === null ||
+			left instanceof One ||
+			left instanceof Two ||
+			left instanceof Three ||
+			left instanceof Four,
+	);
+	assert(
+		right === null ||
+			right instanceof One ||
+			right instanceof Two ||
+			right instanceof Three ||
+			right instanceof Four,
+	);
 	this._left = left;
 	this._middle = middle;
 	this._right = right;

src/0-core/split/deepL.js

@@ -1,19 +1,33 @@
 import assert from 'assert';
 
-import {Digit} from '../../1-digit/0-Digit.js';
+import {One} from '../../1-digit/1-One.js';
+import {Two} from '../../1-digit/2-Two.js';
+import {Three} from '../../1-digit/3-Three.js';
+import {Four} from '../../1-digit/4-Four.js';
 import {Deep, Tree} from '../../3-tree/index.js';
 import delayTail from '../../4-lazy/delayTail.js';
 
 /**
  * @param {any} M
- * @param {Digit|null} left
+ * @param {null|One|Two|Three|Four} left
  * @param {Tree} middle
- * @param {Digit} right
+ * @param {One|Two|Three|Four} right
  */
 export function deepL(M, left, middle, right) {
-	assert(left === null || left instanceof Digit);
+	assert(
+		left === null ||
+			left instanceof One ||
+			left instanceof Two ||
+			left instanceof Three ||
+			left instanceof Four,
+	);
 	assert(middle instanceof Tree);
-	assert(right instanceof Digit);
+	assert(
+		right instanceof One ||
+			right instanceof Two ||
+			right instanceof Three ||
+			right instanceof Four,
+	);
 
 	if (left === null) {
 		if (middle.isEmpty()) return right._tree(M);

src/0-core/split/deepR.js

@@ -1,19 +1,33 @@
 import assert from 'assert';
 
-import {Digit} from '../../1-digit/0-Digit.js';
+import {One} from '../../1-digit/1-One.js';
+import {Two} from '../../1-digit/2-Two.js';
+import {Three} from '../../1-digit/3-Three.js';
+import {Four} from '../../1-digit/4-Four.js';
 import {Deep, Tree} from '../../3-tree/index.js';
 import delayInit from '../../4-lazy/delayInit.js';
 
 /**
  * @param {any} M
- * @param {Digit} left
+ * @param {One|Two|Three|Four} left
  * @param {Tree} middle
- * @param {Digit|null} right
+ * @param {null|One|Two|Three|Four} right
  */
 export function deepR(M, left, middle, right) {
-	assert(left instanceof Digit);
+	assert(
+		left instanceof One ||
+			left instanceof Two ||
+			left instanceof Three ||
+			left instanceof Four,
+	);
 	assert(middle instanceof Tree);
-	assert(right === null || right instanceof Digit);
+	assert(
+		right === null ||
+			right instanceof One ||
+			right instanceof Two ||
+			right instanceof Three ||
+			right instanceof Four,
+	);
 
 	if (right === null) {
 		if (middle.isEmpty()) return left._tree(M);

src/1-digit/0-Digit.js

@@ -5,15 +5,13 @@ import {Single} from '../3-tree/implementations/1-Single.js';
 import {Deep} from '../3-tree/implementations/2-Deep.js';
 import delayTail from '../4-lazy/delayTail.js';
 import delayInit from '../4-lazy/delayInit.js';
-import {Digit, Two, Three, Four} from './index.js';
+import {Two, Three, Four} from './index.js';
 
 export function One(a) {
 	this.a = a;
 	this.v = null;
 }
 
-One.prototype = new Digit();
-
 One.prototype.measure = function (M) {
 	if (this.v === null) this.v = M.measure(this.a);
 	return this.v;

src/1-digit/1-One.js

@@ -4,16 +4,14 @@ import {DigitSplit} from '../0-core/split/DigitSplit.js';
 import empty from '../5-api/empty.js';
 import {cache} from '../0-core/measure/cache.js';
 import {Deep} from '../3-tree/implementations/2-Deep.js';
-import {Digit, One, Three, Four} from './index.js';
+import {One, Three, Four} from './index.js';
 
 export function Two(a, b) {
 	this.a = a;
 	this.b = b;
 	this.v = null;
 }
 
-Two.prototype = new Digit();
-
 Two.prototype.measure = function (M) {
 	if (this.v === null) this.v = M.plus(M.measure(this.a), M.measure(this.b));
 	return this.v;

src/1-digit/2-Two.js

@@ -4,7 +4,7 @@ import {DigitSplit} from '../0-core/split/DigitSplit.js';
 import empty from '../5-api/empty.js';
 import {cache} from '../0-core/measure/cache.js';
 import {Deep} from '../3-tree/implementations/2-Deep.js';
-import {Digit, One, Two, Four} from './index.js';
+import {One, Two, Four} from './index.js';
 
 export function Three(a, b, c) {
 	this.a = a;
@@ -13,8 +13,6 @@ export function Three(a, b, c) {
 	this.v = null;
 }
 
-Three.prototype = new Digit();
-
 Three.prototype.measure = function (M) {
 	if (this.v === null)
 		this.v = M.plus(

src/1-digit/3-Three.js

@@ -4,7 +4,7 @@ import {DigitSplit} from '../0-core/split/DigitSplit.js';
 import {node2, node3} from '../2-node/index.js';
 import empty from '../5-api/empty.js';
 import {Deep} from '../3-tree/implementations/2-Deep.js';
-import {Digit, One, Two, Three} from './index.js';
+import {One, Two, Three} from './index.js';
 
 export function Four(a, b, c, d) {
 	this.a = a;
@@ -14,8 +14,6 @@ export function Four(a, b, c, d) {
 	this.v = null;
 }
 
-Four.prototype = new Digit();
-
 Four.prototype.measure = function (M) {
 	if (this.v === null)
 		this.v = M.plus(

src/1-digit/4-Four.js

@@ -1,4 +1,3 @@
-export * from './0-Digit.js';
 export * from './1-One.js';
 export * from './2-Two.js';
 export * from './3-Three.js';