Internal lib - Add utility function to check existence of nested attr in obj

Author: graphieros

src/lib.js

@@ -1754,6 +1754,16 @@ export function applyDataLabel(func, data, fallbackValue, config) {
     return isValid ? value : fallbackValue;
 }
 
+export function hasDeepProperty(obj, path) {
+    return path.split('.').every(key => {
+        if (obj !== null && typeof obj === 'object' && key in obj) {
+            obj = obj[key];
+            return true;
+        }
+        return false;
+    });
+}
+
 const lib = {
     XMLNS,
     abbreviate,
@@ -1797,6 +1807,7 @@ const lib = {
     getMissingDatasetAttributes,
     getPalette,
     giftWrap,
+    hasDeepProperty,
     interpolateColorHex,
     isFunction,
     isSafeValue,

tests/lib.test.js

@@ -34,6 +34,7 @@ import {
     functionReturnsString,
     generateSpiralCoordinates,
     getMissingDatasetAttributes,
+    hasDeepProperty,
     hslToRgb,
     interpolateColorHex,
     isFunction,
@@ -1846,3 +1847,22 @@ describe('applyDataLabel', () => {
         )).toStrictEqual('p-12-s');
     });
 });
+
+describe('hasDeepProperty', () => {
+    const obj = {
+        attr0: {
+            attr1: {
+                attr2: {
+                    attr3 : 'A'
+                }
+            }
+        }
+    }
+    test('checks if an object as a deep property', () => {
+        expect(hasDeepProperty(obj, 'attr0')).toBe(true)
+        expect(hasDeepProperty(obj, 'attr0.attr1')).toBe(true)
+        expect(hasDeepProperty(obj, 'attr0.attr1.attr2')).toBe(true)
+        expect(hasDeepProperty(obj, 'attr0.attr1.attr2.attr3')).toBe(true)
+        expect(hasDeepProperty(obj, 'attr0.attr1.attr2.attr3.attr4')).toBe(false)
+    })
+})