Chapter 7: initial samples

Chapter07/leveldb-filter/filter.js

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+const levelup = require('levelup')
+const leveldown = require('leveldown')
+const db = levelup(leveldown('./data'))
+
+db.put('Task:1', '')
+db.put('Task:2', '')
+db.put('Task:3', '')
+db.put('Task:4', '')
+
+db.createReadStream({
+    gte: 'Task:1',
+    lte: 'Task:3'
+}).on('data', function (data) {
+    console.log(data.key.toString())
+})
+
+
+
+  
+
+db.batch()
+  .put('forename', 'Beth')
+  .put('surname', 'Griggs')
+  .del('forename')
+  .write(() => console.log('Batch operations complete.'))