fix

Johan Wiltink · Johan Wiltink · commit 3de99e7366df · 2022-07-01T02:45:03.000+02:00
diff --git a/src/lambda-calculus.js b/src/lambda-calculus.js
@@ -58,7 +58,7 @@ class A {
     this.left = left;
     this.right = right;
   }
-  free() { return union( this.left.free?.() ?? [] , this.right.free?.() ?? [] ); }
+  free() { return union( this.left.free?.() || [] , this.right.free?.() || [] ); }
   toString() {
     const left = this.left instanceof L ? `(${this.left})` : this.left ;
     const right = this.right instanceof V ? this.right : `(${this.right})` ;

Original file line number	Diff line number	Diff line change
`@@ -58,7 +58,7 @@ class A {`
`58`	`58`	`this.left = left;`
`59`	`59`	`this.right = right;`
`60`	`60`	`}`
`61`		`- free() { return union( this.left.free?.() ?? [] , this.right.free?.() ?? [] ); }`
	`61`	`+ free() { return union( this.left.free?.() \|\| [] , this.right.free?.() \|\| [] ); }`
`62`	`62`	`toString() {`
`63`	`63`	const left = this.left instanceof L ? `(${this.left})` : this.left ;
`64`	`64`	const right = this.right instanceof V ? this.right : `(${this.right})` ;