freeze doc - mv js code samples to includes

content/code_samples/freeze/check-individual-freeze.js

@@ -0,0 +1,37 @@
+const {RippleAPI} = require('ripple-lib');
+
+const api = new RippleAPI({
+  server: 'wss://s1.ripple.com' // Public rippled server
+});
+api.on('error', (errorCode, errorMessage) => {
+  console.log(errorCode + ': ' + errorMessage);
+});
+
+const my_address = 'rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn';
+const counterparty_address = 'rUpy3eEg8rqjqfUoLeBnZkscbKbFsKXC3v';
+const frozen_currency = 'USD';
+
+api.connect().then(() => {
+
+  // Look up current state of trust line
+  const options = {counterparty: counterparty_address,
+                   currency: frozen_currency};
+  console.log('looking up', frozen_currency, 'trust line from',
+              my_address, 'to', counterparty_address);
+  return api.getTrustlines(my_address, options);
+
+}).then(data => {
+
+  if (data.length !== 1) {
+    throw 'should only be 1 trust line per counterparty+currency pair';
+  }
+
+  const trustline = data[0];
+  console.log('Trust line frozen from our side?',
+              trustline.specification.frozen === true);
+  console.log('Trust line frozen from counterparty\'s side?',
+              trustline.counterparty.frozen === true);
+
+}).then(() => {
+  return api.disconnect();
+}).catch(console.error);