[js] Make nqp::atposnd return null when there is a missing element

pmurias · pmurias · commit 01429c3c1566 · 2017-10-09T20:49:37.000+02:00
diff --git a/src/vm/js/nqp-runtime/reprs.js b/src/vm/js/nqp-runtime/reprs.js
@@ -1735,7 +1735,9 @@ class MultiDimArray extends REPR {
 
       $$atposnd(idx) {
         if (STable.primType != 0) throw new NQPException('wrong type');
-        return this.storage[this.$$calculateIndex(idx)];
+        const value = this.storage[this.$$calculateIndex(idx)];
+        if (value === undefined) return Null;
+        return value;
       }
 
       $$bindposnd(idx, value) {

Original file line number	Diff line number	Diff line change
`@@ -1735,7 +1735,9 @@ class MultiDimArray extends REPR {`
`1735`	`1735`
`1736`	`1736`	`$$atposnd(idx) {`
`1737`	`1737`	`if (STable.primType != 0) throw new NQPException('wrong type');`
`1738`		`- return this.storage[this.$$calculateIndex(idx)];`
	`1738`	`+ const value = this.storage[this.$$calculateIndex(idx)];`
	`1739`	`+ if (value === undefined) return Null;`
	`1740`	`+ return value;`
`1739`	`1741`	`}`
`1740`	`1742`
`1741`	`1743`	`$$bindposnd(idx, value) {`