test: replace function with arrow function and remove unused argument

PR-URL: #38235
Reviewed-By: Yash Ladha <yash@yashladha.in>
Reviewed-By: Pooja D P <Pooja.D.P@ibm.com>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

test/parallel/test-readline-interface.js

@@ -248,7 +248,7 @@ 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++;
   });
@@ -324,7 +324,7 @@ 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++;
   });
@@ -351,7 +351,7 @@ 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;
@@ -766,7 +766,7 @@ 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 });
@@ -861,7 +861,7 @@ 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'));
     });
@@ -905,7 +905,7 @@ 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();
     });
@@ -957,7 +957,7 @@ 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');
@@ -979,7 +979,7 @@ 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');