Started implementing constant property

app/imports/parser/parseTree/ArrayNode.js

@@ -1,10 +1,27 @@
 import ParseNode from '/imports/parser/parseTree/ParseNode.js';
+import ConstantNode from '/imports/parser/parseTree/ConstantNode.js';
 
 export default class ArrayNode extends ParseNode {
   constructor({values}) {
     super(...arguments);
     this.values = values;
   }
+  static fromConstantArray(array){
+    let values = array.map( value => {
+      let type = typeof value;
+      if (
+        type === 'string' ||
+        type === 'number' ||
+        type === 'boolean' ||
+        type === 'undefined'
+      ){
+        return new ConstantNode({value, type});
+      } else {
+        throw `Unexpected type in constant array: ${type}`
+      }
+    });
+    return new ArrayNode({values});
+  }
   resolve(fn, scope, context){
     let values = this.values.map(node => node[fn](scope, context));
     return new ArrayNode({values});