Expose hasPath and hasPathIn.

hasPath.js

@@ -0,0 +1,53 @@
+import castPath from './.internal/castPath.js'
+import isArguments from './isArguments.js'
+import isIndex from './.internal/isIndex.js'
+import isLength from './isLength.js'
+import toKey from './.internal/toKey.js'
+
+/** Used to check objects for own properties. */
+const hasOwnProperty = Object.prototype.hasOwnProperty
+
+/**
+ * Checks if `path` is a direct property of `object`.
+ *
+ * @since 5.0.0
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path to check.
+ * @returns {boolean} Returns `true` if `path` exists, else `false`.
+ * @see has, hasIn, hasPathIn
+ * @example
+ *
+ * const object = { 'a': { 'b': 2 } }
+ * const other = create({ 'a': create({ 'b': 2 }) })
+ *
+ * hasPath(object, 'a.b')
+ * // => true
+ *
+ * hasPath(object, ['a', 'b'])
+ * // => true
+ */
+function hasPath(object, path) {
+  path = castPath(path, object)
+
+  let key
+  let index = -1
+  let length = path.length
+  let result = false
+
+  while (++index < length) {
+    key = toKey(path[index])
+    if (!(result = object != null && hasOwnProperty.call(object, key))) {
+      break
+    }
+    object = object[key]
+  }
+  if (result || ++index != length) {
+    return result
+  }
+  length = object == null ? 0 : object.length
+  return !!length && isLength(length) && isIndex(key, length) &&
+    (Array.isArray(object) || isArguments(object))
+}
+
+export default hasPath

hasPathIn.js

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+import castPath from './.internal/castPath.js'
+import isArguments from './isArguments.js'
+import isIndex from './.internal/isIndex.js'
+import isLength from './isLength.js'
+import toKey from './.internal/toKey.js'
+
+/**
+ * Checks if `path` is a direct property of `object`.
+ *
+ * @since 5.0.0
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path to check.
+ * @returns {boolean} Returns `true` if `path` exists, else `false`.
+ * @see has, hasIn hasPath
+ * @example
+ *
+ * const object = { 'a': { 'b': 2 } }
+ * const other = create({ 'a': create({ 'b': 2 }) })
+ *
+ * hasPathIn(object, 'a.b')
+ * // => true
+ *
+ * hasPathIn(object, ['a', 'b'])
+ * // => true
+ */
+function hasPathIn(object, path) {
+  path = castPath(path, object)
+
+  let key
+  let index = -1
+  let length = path.length
+  let result = false
+
+  while (++index < length) {
+    key = toKey(path[index])
+    if (!(result = object != null && key in Object(object))) {
+      break
+    }
+    object = object[key]
+  }
+  if (result || ++index != length) {
+    return result
+  }
+  length = object == null ? 0 : object.length
+  return !!length && isLength(length) && isIndex(key, length) &&
+    (Array.isArray(object) || isArguments(object))
+}
+
+export default hasPath