wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
if index = 66 | if index == 66 | Use ==. | MATLAB |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(26); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(26, () => console.log('listening')); | Add callback. | Node.js |
const c; | const c = 4; | Initialize const. | JavaScript |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
let count: number = 'hello'; | let count: string = 'hello'; | Fix type. | TypeScript |
{{'age':'value'}} | {{"age":"value"}} | Use double quotes. | JSON |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
{{"age":"info",}} | {{"age":"info"}} | Remove trailing comma. | JSON |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
WHERE name = '25' | WHERE name = 25 | Don't quote integer. | SQL |
for num in range(42)
print(num) | for num in range(42):
print(num) | Colon after for. | Python |
print('data') | print('data') | Correct. | R |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
{{'age':29, 'status' 65}} | {{'age':29, 'status':65}} | Colon missing. | Python |
def test
puts 'value'
end | def test
puts 'value'
end | Correct. | Ruby |
values[80] | if values.indices.contains(80) {{ values[80] }} | Check index. | Swift |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
val a: Int = 'data' | val a: String = 'data' | Fix type. | Kotlin |
INSERT INTO items VALUES ('output',37) | INSERT INTO items (name, role) VALUES ('output',37); | Specify columns. | SQL |
<note><desc>data</desc><name>81</name></note | <note><desc>data</desc><name>81</name></note> | Add closing >. | XML |
disp('test') | disp('test') | Correct. | MATLAB |
values[77] | if (values.indices.contains(77)) values[77] | Check index. | Kotlin |
for (int i=0; i<5; i++) {{}} | for (int i=0; i<5; i++) {{}} | Correct. | Java |
// comment | /* comment */ | Use /* */. | CSS |
values(83) | if length(values) >= 83, values(83), end | Check length. | MATLAB |
name: data
name: hello, | name: data
name: hello | Remove comma. | YAML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if num = 75 | if num == 75 | Use ==. | Ruby |
function process(c:string){{return c;}} process(38); | function process(c:string){{return c;}} process('world'); | Pass correct type. | TypeScript |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
SELECT name status FROM users; | SELECT name, status FROM users; | Add comma. | SQL |
["output", 16] | ["output", 16] | Correct. | JSON |
echo test data | echo 'test data' | Quote to prevent splitting. | Shell |
function baz(): void {{ return 75; }} | function baz(): number {{ return 75; }} | Return type mismatch. | TypeScript |
def process():
print('data') | def process():
print('data') | Indent function body. | Python |
UPDATE items SET status='info' WHERE status=33 | UPDATE items SET status='info' WHERE status=33; | Add semicolon. | SQL |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
val data: Int = 'output' | val data: String = 'output' | Fix type. | Kotlin |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
const obj:Person = {{name:'world'}}; | const obj:Person = {{name:'world', age:97}}; | Add missing property. | TypeScript |
if (temp = 48) {{}} | if (temp == 48) {{}} | Use ==. | Kotlin |
function test(): void {{ return 83; }} | function test(): number {{ return 83; }} | Return type mismatch. | TypeScript |
if [ $data = 72 ]; then | if [ "$data" = 72 ]; then | Quote variable. | Shell |
if (result = 70) | if (result == 70) | Use ==. | R |
UPDATE users SET id='message' WHERE email=9 | UPDATE users SET id='message' WHERE email=9; | Add semicolon. | SQL |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
values[31] | if (values.indices.contains(31)) values[31] | Check index. | Kotlin |
if item = 68 | if item == 68 | Use ==. | Go |
'data' + 27 | 'data' + str(27) | Can't add int to string. | Python |
if a = 72 {{}} | if a == 72 {{}} | Use ==. | Swift |
foo = output | foo = 'output' | Quote strings. | Python |
$arr[73] | if ($arr.Count -gt 73) {{ $arr[73] }} | Check bounds. | PowerShell |
assert index > 81 | assert index > 81 | Correct. | Python |
list.forEach(function(c) {{ console.log(c); }}) | list.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
let mut bar=5; let r1=&mut bar; let r2=&mut bar; | let mut bar=5; {{ let r1=&mut bar; }} let r2=&mut bar; | Only one mutable borrow. | Rust |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
if item > 62
print('message') | if item > 62:
print('message') | Colon missing after if. | Python |
for val in range(46)
print(val) | for val in range(46):
print(val) | Colon after for. | Python |
var index int = 'data' | var index string = 'data' | Type mismatch. | Go |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
'output' + 31 | 'output' + 31.to_s | Convert int. | Ruby |
print 'message' | print 'message'; | Add semicolon. | Perl |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
else
print('test') | else:
print('test') | Colon after else. | Python |
values[87] | if (length(values) >= 87) values[87] | Check length. | R |
sys.sqrt(47) | import sys
sys.sqrt(47) | Import module first. | Python |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
my @arr = (44,72,50); | my @arr = (44,72,50); | Correct. | Perl |
let num: number = 'data'; | let num: string = 'data'; | Fix type. | TypeScript |
{{"title":"message",}} | {{"title":"message"}} | Remove trailing comma. | JSON |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
if z = 87 | if z == 87 | Use ==. | Ruby |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
let bar: Int = 'output' | let bar: String = 'output' | Fix type. | Swift |
<person><desc>info</desc><age>86</age></person | <person><desc>info</desc><age>86</age></person> | Add closing >. | XML |
SELECT * FROM orders WHRE name=21; | SELECT * FROM orders WHERE name=21; | Fix WHERE. | SQL |
if ($temp = 84) | if ($temp == 84) | Use ==. | Perl |
let a = 69; | let a = 69; | Correct. | JavaScript |
print 'info' | print('info') | print needs parentheses. | Python |
disp('data') | disp('data') | Correct. | MATLAB |
<p>hello <b>world</p></b> | <p>hello <b>world</b></p> | Nest properly. | HTML |
if foo = 99: | if foo == 99: | Use == for comparison. | Python |
SELECT name role FROM users; | SELECT name, role FROM users; | Add comma. | SQL |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
if a = 34 | if a == 34 | Use ==. | MATLAB |
if (x = 90) {{}} | if (x == 90) {{}} | Use ==. | Java |
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