test: replace function with arrow function and remove unused argument

Author: andresatencio

test/parallel/test-readline-interface.js

@@ -277,7 +277,7 @@ function assertCursorRowsAndCols(rli, rows, cols) {
  const expectedLines = ['foo', 'bar', 'baz', 'bar', 'bat', 'bat'];
  // ['foo', 'baz', 'bar', bat'];
  let callCount = 0;
- rli.on('line', function(line) {
+ rli.on('line', (line) => {
  assert.strictEqual(line, expectedLines[callCount]);
  callCount++;
  });
@@ -353,7 +353,7 @@ function assertCursorRowsAndCols(rli, rows, cols) {
  });
  const expectedLines = ['foo', 'bar', 'baz', 'bar', 'bat', 'bat'];
  let callCount = 0;
- rli.on('line', function(line) {
+ rli.on('line', (line) => {
  assert.strictEqual(line, expectedLines[callCount]);
  callCount++;
  });
@@ -380,7 +380,7 @@ function assertCursorRowsAndCols(rli, rows, cols) {
  const [rli, fi] = getInterface({ terminal: true });
  const keys = [];
  const err = new Error('bad thing happened');
- fi.on('keypress', function(key) {
+ fi.on('keypress', (key) => {
  keys.push(key);
  if (key === 'X') {
  throw err;
@@ -795,7 +795,7 @@ for (let i = 0; i < 12; i++) {
  assert.strictEqual(isWarned(process.stdout._events), false);
 }
 
-[true, false].forEach(function(terminal) {
+[true, false].forEach((terminal) => {
  // Disable history
  {
  const [rli, fi] = getInterface({ terminal, historySize: 0 });
@@ -890,7 +890,7 @@ for (let i = 0; i < 12; i++) {
  const buf = Buffer.from('☮', 'utf8');
  const [rli, fi] = getInterface({ terminal });
  let callCount = 0;
- rli.on('line', function(line) {
+ rli.on('line', (line) => {
  callCount++;
  assert.strictEqual(line, buf.toString('utf8'));
  });
@@ -1004,7 +1004,7 @@ for (let i = 0; i < 12; i++) {
  rli.setPrompt('ddd> ');
  rli.prompt();
  rli.write("really shouldn't be seeing this");
- rli.question('What do you think of node.js? ', function(answer) {
+ rli.question('What do you think of node.js? ', (answer) => {
  console.log('Thank you for your valuable feedback:', answer);
  rli.close();
  });
@@ -1056,7 +1056,7 @@ for (let i = 0; i < 12; i++) {
  const crlfDelay = 200;
  const [rli, fi] = getInterface({ terminal, crlfDelay });
  let callCount = 0;
- rli.on('line', function(line) {
+ rli.on('line', () => {
  callCount++;
  });
  fi.emit('data', '\r');
@@ -1078,7 +1078,7 @@ for (let i = 0; i < 12; i++) {
  const delay = 200;
  const [rli, fi] = getInterface({ terminal, crlfDelay });
  let callCount = 0;
- rli.on('line', function(line) {
+ rli.on('line', () => {
  callCount++;
  });
  fi.emit('data', '\r');