fixes #87

Johan Wiltink · Johan Wiltink · commit 848dccd25d0b · 2022-04-14T05:21:05.000+02:00
diff --git a/src/lambda-calculus.js b/src/lambda-calculus.js
@@ -382,10 +382,9 @@ function evalLC(term) {
           env = lastEnv;
         } else { // lastTerm is a JS function
           const res = lastTerm(term);
-          if ( res.term ) {
-            ({term, env} = res);
-            if ( ! env ) env = new Env;
-          } else
+          if ( res?.term )
+            ( {term, env=new Env} = res );
+          else
             term = res;
         }
       }

Original file line number	Diff line number	Diff line change
`@@ -382,10 +382,9 @@ function evalLC(term) {`
`382`	`382`	`env = lastEnv;`
`383`	`383`	`} else { // lastTerm is a JS function`
`384`	`384`	`const res = lastTerm(term);`
`385`		`- if ( res.term ) {`
`386`		`- ({term, env} = res);`
`387`		`- if ( ! env ) env = new Env;`
`388`		`- } else`
	`385`	`+ if ( res?.term )`
	`386`	`+ ( {term, env=new Env} = res );`
	`387`	`+ else`
`389`	`388`	`term = res;`
`390`	`389`	`}`
`391`	`390`	`}`