DOC-3933: final 8 tabbed code examples (#2784)

doctests/dt-bitfield.js

@@ -0,0 +1,76 @@
+// EXAMPLE: bitfield_tutorial
+// HIDE_START
+import assert from 'assert';
+import { createClient } from 'redis';
+
+const client = createClient();
+await client.connect();
+// HIDE_END
+
+// REMOVE_START
+await client.flushDb();
+// REMOVE_END
+
+// STEP_START bf
+let res1 = await client.bitField("bike:1:stats", [{
+  operation: 'SET',
+  encoding: 'u32',
+  offset: '#0',
+  value: 1000
+}]);
+console.log(res1);  // >>> [0]
+
+let res2 = await client.bitField('bike:1:stats', [
+  {
+    operation: 'INCRBY',
+    encoding: 'u32',
+    offset: '#0',
+    increment: -50
+  },
+  {
+    operation: 'INCRBY',
+    encoding: 'u32',
+    offset: '#1',
+    increment: 1
+  }
+]);
+console.log(res2);  // >>> [950, 1]
+
+let res3 = await client.bitField('bike:1:stats', [
+  {
+    operation: 'INCRBY',
+    encoding: 'u32',
+    offset: '#0',
+    increment: 500
+  },
+  {
+    operation: 'INCRBY',
+    encoding: 'u32',
+    offset: '#1',
+    increment: 1
+  }
+]);
+console.log(res3);  // >>> [1450, 2]
+
+let res4 = await client.bitField('bike:1:stats', [
+  {
+    operation: 'GET',
+    encoding: 'u32',
+    offset: '#0'
+  },
+  {
+    operation: 'GET',
+    encoding: 'u32',
+    offset: '#1'
+  }
+]);
+console.log(res4);  // >>> [1450, 2]
+// STEP_END
+
+// REMOVE_START
+assert.deepEqual(res1, [0])
+assert.deepEqual(res2, [950, 1])
+assert.deepEqual(res3, [1450, 2])
+assert.deepEqual(res4, [1450, 2])
+await client.quit();
+// REMOVE_END