Update examples for 0.90 (#1225)

* Update examples for 0.90

* Fix number typo

* Adapth to use timestamp.now (blockPeriod now in all versions)

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

@@ -15,7 +15,7 @@ async function main () {
   // are found, the call itself returns a promise with a subscription that can be
   // used to unsubscribe from the newHead subscription
   const unsubscribe = await api.rpc.chain.subscribeNewHead((header) => {
-    console.log(`Chain is at block: #${header.blockNumber}`);
+    console.log(`Chain is at block: #${header.number}`);
 
     if (++count === 256) {
       unsubscribe();

docs/examples/promise/04_unsubscribe/index.js

@@ -8,7 +8,7 @@ async function main () {
 
   // Subscribe to chain updates and log the current block  number on update.
   const unsubscribe = await api.rpc.chain.subscribeNewHead((header) => {
-    console.log(`Chain is at block: #${header.blockNumber}`);
+    console.log(`Chain is at block: #${header.number}`);
   });
 
   // In this example we're calling the unsubscribe() function that is being

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

@@ -10,14 +10,14 @@ async function main () {
   const api = await ApiPromise.create();
 
   // Make our basic chain state/storage queries, all in one go
-  const [accountNonce, blockPeriod, validators] = await Promise.all([
+  const [accountNonce, now, validators] = await Promise.all([
     api.query.system.accountNonce(ALICE),
-    api.query.timestamp.blockPeriod(),
+    api.query.timestamp.now(),
     api.query.session.validators()
   ]);
 
   console.log(`accountNonce(${ALICE}) ${accountNonce}`);
-  console.log(`blockPeriod ${blockPeriod.toNumber()} seconds`);
+  console.log(`last block timestamp ${now.toNumber()}`);
 
   if (validators && validators.length > 0) {
     // Retrieve the balances for all validators

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

@@ -2,7 +2,7 @@
 // Import the API, Keyring and some utility functions
 const { ApiPromise } = require('@polkadot/api');
 const { Keyring } = require('@polkadot/keyring');
-const { ExtrinsicEra } = require('@polkadot/types/type');
+const { createType } = require('@polkadot/types');
 
 const BOB = '5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty';
 
@@ -26,8 +26,10 @@ async function main () {
   const currentHeight = signedBlock.block.header.number;
   const blockHash = signedBlock.block.header.hash;
 
+  // NOTE By default the API will send mortal transactions, only explicitly construct
+  // if you wish to override the defaults
   // construct a mortal era
-  const era = new ExtrinsicEra({ current: currentHeight, period: 10 });
+  const era = createType('ExtrinsicEra', { current: currentHeight, period: 10 });
 
   // Create an extrinsic, transferring 12345 units to Bob
   const transfer = api.tx.balances.transfer(BOB, 12345);

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

@@ -13,7 +13,7 @@ async function main () {
         api.rpc.chain.subscribeNewHead()
       ))
     .subscribe((header) => {
-      console.log(`Chain is at block: #${header.blockNumber}`);
+      console.log(`Chain is at block: #${header.number}`);
     });
 }
 

docs/examples/rx/04_unsubscribe/index.js

@@ -12,7 +12,7 @@ async function main () {
         api.rpc.chain.subscribeNewHead()
       ))
     .subscribe((header) => {
-      console.log(`Chain is at block: #${header.blockNumber}`);
+      console.log(`Chain is at block: #${header.number}`);
     });
 
   // In this example we're calling the Overvables unsubscribe() //