Remove unused valAt utility (#513)

Author: merlinnot

spec/utils.spec.ts

@@ -21,7 +21,7 @@
 // SOFTWARE.
 
 import { expect } from 'chai';
-import { applyChange, normalizePath, pathParts, valAt } from '../src/utils';
+import { applyChange, normalizePath, pathParts } from '../src/utils';
 
 describe('utils', () => {
   describe('.normalizePath(path: string)', () => {
@@ -42,27 +42,6 @@ describe('utils', () => {
     });
   });
 
-  describe('.valAt(source: any, path?: string): any', () => {
-    it('should be null if null along any point in the path', () => {
-      expect(valAt(null)).to.be.null;
-      expect(valAt(null, '/foo')).to.be.null;
-      expect(valAt({ a: { b: null } }, '/a/b/c')).to.be.null;
-    });
-
-    it('should be null if accessing a path past a leaf value', () => {
-      expect(valAt({ a: 2 }, '/a/b')).to.be.null;
-    });
-
-    it('should be the leaf value if one is present', () => {
-      expect(valAt({ a: { b: 23 } }, '/a/b')).to.eq(23);
-      expect(valAt({ a: { b: 23 } }, '/a')).to.deep.equal({ b: 23 });
-    });
-
-    it('should be undefined if in unexplored territory', () => {
-      expect(valAt({ a: 23 }, '/b')).to.be.undefined;
-    });
-  });
-
   describe('.applyChange(from: any, to: any): any', () => {
     it('should return the to value for non-object values of from and to', () => {
       expect(applyChange({ a: 'b' }, null)).to.eq(null);

src/utils.ts

@@ -61,34 +61,3 @@ export function pruneNulls(obj: any) {
   }
   return obj;
 }
-
-export function valAt(source: any, path?: string) {
-  if (source === null) {
-    return null;
-  } else if (typeof source !== 'object') {
-    return path ? null : source;
-  }
-
-  const parts = pathParts(path);
-  if (!parts.length) {
-    return source;
-  }
-
-  let cur = source;
-  let leaf;
-  while (parts.length) {
-    const key = parts.shift();
-    if (cur[key] === null || leaf) {
-      return null;
-    } else if (typeof cur[key] === 'object') {
-      if (parts.length) {
-        cur = cur[key];
-      } else {
-        return cur[key];
-      }
-    } else {
-      leaf = cur[key];
-    }
-  }
-  return leaf;
-}