fix: Fix promise examples minor typos in comments and variable name. Capitalise comments (#276)

docs/examples/promise/01_simple_connect/index.js

@@ -1,15 +1,15 @@
-// required imports
+// Required imports
 const { ApiPromise } = require('@polkadot/api');
 const { WsProvider } = require('@polkadot/rpc-provider');
 
 async function main () {
-  // initialise the provider to connect to the local node
+  // Initialise the provider to connect to the local node
   const provider = new WsProvider('ws://127.0.0.1:9944');
 
-  // create the API and wait until ready
+  // Create the API and wait until ready
   const api = await ApiPromise.create(provider);
 
-  // retrieve the chain & node information information via rpc calls
+  // Retrieve the chain & node information information via rpc calls
   const [chain, nodeName, nodeVersion] = await Promise.all([
     api.rpc.system.chain(),
     api.rpc.system.name(),

docs/examples/promise/02_listen_to_blocks/index.js

@@ -1,4 +1,4 @@
-// API imports
+// Import the API
 const { ApiPromise } = require('@polkadot/api');
 
 async function main () {
@@ -10,13 +10,13 @@ async function main () {
   // Subscribe to the new headers on-chain. The callback is fired when new headers
   // are found, the call itself returns a promise with a subscription that can be
   // used to unsubscribe from the newHead subscription
-  const subsciptionId = await api.rpc.chain.newHead((header) => {
+  const subscriptionId = await api.rpc.chain.newHead((header) => {
     console.log(`best #${header.blockNumber}`);
   });
 
-  // id for the subscription, we can cleanup and unsubscribe via
+  // Id for the subscription, we can cleanup and unsubscribe via
   // `api.chain.newHead.unsubscribe(subscriptionId)`
-  console.log(`subsciptionId: ${subsciptionId}`);
+  console.log(`subsciptionId: ${subscriptionId}`);
 }
 
 main().catch(console.error);

docs/examples/promise/03_listen_to_balance_change/index.js

@@ -1,27 +1,27 @@
-// import the Api
+// Import the Api
 const { ApiPromise } = require('@polkadot/api');
 
-// the known account we want to use (available on dev chain, with funds)
+// Known account we want to use (available on dev chain, with funds)
 const Alice = '5GoKvZWG5ZPYL1WUovuHW3zJBWBP5eT8CbqjdRY4Q6iMaDtZ';
 
 async function main () {
-  // Create an wait for the API
+  // Create an await for the API
   const api = await ApiPromise.create();
 
   // Retrieve the initial balance. Since the call has no callback, it is simply a promise
-  // the resolves to the current on-chain value
+  // that resolves to the current on-chain value
   let previous = await api.query.balances.freeBalance(Alice);
 
-  console.log(`${Alice} has an ${previous} balance`);
+  console.log(`${Alice} has a ${previous} balance`);
   console.log(`You may leave this example running and start example 06 or transfer any value to ${Alice}`);
 
-  // Here we subscribe to any balance changes and updates the on-screen value
+  // Here we subscribe to any balance changes and update the on-screen value
   api.query.balances.freeBalance(Alice, (current) => {
     // Calculate the delta
     const change = current.sub(previous);
 
-    // Only display positive value changes (Since we are pulling previous above already,
-    // the intiial balance change will also be zero)
+    // Only display positive value changes (Since we are pulling `previous` above already,
+    // the initial balance change will also be zero)
     if (change.isZero()) {
       return;
     }

docs/examples/promise/05_read_storage/index.js

@@ -1,11 +1,11 @@
-// Import the ApiPromise
+// Import the API
 const { ApiPromise } = require('@polkadot/api');
 
 // Our address for Alice on the dev chain
 const Alice = '5GoKvZWG5ZPYL1WUovuHW3zJBWBP5eT8CbqjdRY4Q6iMaDtZ';
 
 async function main () {
-  // Create out API with a default connection to the local node
+  // Create our API with a default connection to the local node
   const api = await ApiPromise.create();
 
   // Make our basic chain state/storage queries, all in one go
@@ -18,7 +18,7 @@ async function main () {
   console.log(`accountNonce(${Alice}) ${accountNonce}`);
   console.log(`blockPeriod ${blockPeriod.toNumber()} seconds`);
 
-  // get the balances for all validators
+  // Retrieve the balances for all validators
   const validatorBalances = await Promise.all(
     validators.map((authorityId) =>
       api.query.balances.freeBalance(authorityId)

docs/examples/promise/07_transfer_dots/index.js

@@ -1,4 +1,4 @@
-// Import our API, Keyring and some utility functions
+// Import the API, Keyring and some utility functions
 const { ApiPromise } = require('@polkadot/api');
 const Keyring = require('@polkadot/keyring').default;
 const u8aFromUtf8 = require('@polkadot/util/u8a/fromUtf8').default;
@@ -7,16 +7,16 @@ const ALICE_SEED = 'Alice'.padEnd(32, ' ');
 const BOB_ADDR = '5Gw3s7q4QLkSWwknsiPtjujPv3XM4Trxi5d4PgKMMk3gfGTE';
 
 async function main () {
-  // create an instance of the keyring
+  // Create an instance of the keyring
   const keyring = new Keyring();
 
   // Add Alice to our keyring (with the known seed for the account)
   const alice = keyring.addFromSeed(u8aFromUtf8(ALICE_SEED));
 
-  // instantiate the API
+  // Instantiate the API
   const api = await ApiPromise.create();
 
-  // retrieve the nonce for Alice, used to sign the transaction
+  // Retrieve the nonce for Alice, to be used to sign the transaction
   const aliceNonce = await api.query.system.accountNonce(alice.address());
 
   // Create a extrinsic, transferring 12345 units to Bob. We can also create,
@@ -24,10 +24,10 @@ async function main () {
   // here we split it out for the sake of readability
   const transfer = api.tx.balances.transfer(BOB_ADDR, 12345);
 
-  // sign the transaction using our account
+  // Sign the transaction using our account
   transfer.sign(alice, aliceNonce);
 
-  // send the transaction and retrieve the resulting Hash
+  // Send the transaction and retrieve the resulting Hash
   const hash = await transfer.send();
 
   console.log(`transfer 12345 to Bob with hash ${hash}`);