Add db.getMany(keys) (#212)

Ref Level/community#101

Author: vweevers

memdown.js

@@ -158,7 +158,8 @@ function MemDOWN () {
     snapshots: true,
     permanence: false,
     seek: true,
-    clear: true
+    clear: true,
+    getMany: true
   })
 
   this._store = createRBT(ltgt.compare)
@@ -211,6 +212,13 @@ MemDOWN.prototype._get = function (key, options, callback) {
   })
 }
 
+MemDOWN.prototype._getMany = function (keys, options, callback) {
+  this._nextTick(callback, null, keys.map((key) => {
+    const value = this._store.get(key)
+    return value === undefined || options.asBuffer ? value : value.toString()
+  }))
+}
+
 MemDOWN.prototype._del = function (key, options, callback) {
   this._store = this._store.remove(key)
   this._nextTick(callback)

package.json

@@ -23,7 +23,7 @@
     "CONTRIBUTORS.md"
   ],
   "dependencies": {
-    "abstract-leveldown": "^7.0.0",
+    "abstract-leveldown": "^7.2.0",
     "buffer": "^6.0.3",
     "functional-red-black-tree": "^1.0.1",
     "inherits": "^2.0.1",

test.js

@@ -14,8 +14,9 @@ const testCommon = suite.common({
     return memdown()
   },
 
-  // Opt-in to new clear() tests
+  // Opt-in to new tests
   clear: true,
+  getMany: true,
 
   // Opt-out of unsupported features
   createIfMissing: false,