object.deepValue

amida-tech · Mar 4, 2015 · 277d9bd · 277d9bd
1 parent 1c9453f
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diff --git a/RELEASENOTES.md b/RELEASENOTES.md
@@ -1,5 +1,6 @@
 # v1.4.1 - TBD
 
+-object.deepValue(obj, deepProperty);
 -objectset.deepValue(obj, deepProperty, value)
 
 # v1.4.0 - February 27, 2015

diff --git a/lib/object.js b/lib/object.js
@@ -4,6 +4,19 @@ var lodash = require('lodash');
 
 exports.isObject = lodash.isObject;
 
-exports.exists = function (obj) {
+var exists = exports.exists = function (obj) {
     return (obj !== undefined) && (obj !== null);
 };
+
+exports.deepValue = function (obj, deepProperty) {
+    var propertyPieces = deepProperty.split('.');
+    var n = propertyPieces.length;
+    for (var i = 0; i < n; ++i) {
+        if ((!exists(obj)) || (typeof obj !== 'object')) {
+            return null;
+        }
+        var property = propertyPieces[i];
+        obj = obj[property];
+    }
+    return obj;
+};
diff --git a/test/test-object.js b/test/test-object.js
@@ -35,3 +35,72 @@ describe('object.exists', function () {
         expect(exists(r)).to.be.true;
     });
 });
+
+describe('object.deepValue', function () {
+    var deepValue = object.deepValue;
+
+    it('null', function () {
+        var r = null;
+        var v = deepValue(r, 'a.b');
+        expect(v).to.equal(null);
+    });
+
+    it('undefined', function () {
+        var r;
+        var v = deepValue(r, 'a.b');
+        expect(v).to.equal(null);
+    });
+
+    it('5', function () {
+        var r = 5;
+        var v = deepValue(r, 'a.b');
+        expect(v).to.equal(null);
+    });
+
+    it('{}', function () {
+        var r = {};
+        var v = deepValue(r, 'a.b');
+        expect(v).to.equal(null);
+    });
+    it('one level property', function () {
+        var r = {
+            a: "value"
+        };
+        var v = deepValue(r, 'a');
+        expect(v).to.equal(r.a);
+        v = deepValue(r, 'a.b');
+        expect(v).to.equal(null);
+    });
+    it('two level property', function () {
+        var r = {
+            a: {
+                b: "value"
+            },
+            c: 1
+        };
+        var v = deepValue(r, 'a.b');
+        expect(v).to.equal(r.a.b);
+        v = deepValue(r, 'a');
+        expect(v).to.deep.equal(r.a);
+        v = deepValue(r, 'a.b.c');
+        expect(v).to.equal(null);
+        v = deepValue(r, 'a.c.d');
+        expect(v).to.equal(null);
+    });
+    it('three level property', function () {
+        var r = {
+            a: {
+                b: {
+                    c: "value"
+                }
+            }
+        };
+        var v = deepValue(r, 'a.b.c');
+        expect(v).to.equal(r.a.b.c);
+        v = deepValue(r, 'a.b');
+        expect(v).to.deep.equal(r.a.b);
+        v = deepValue(r, 'a.b.c.d');
+        expect(v).to.equal(null);
+    });
+
+});