wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
fn baz() -> i32 {{ 53 }} | fn baz() -> i32 {{ 53 }} | Correct. | Rust |
{{"id":"message" "status":17}} | {{"id":"message", "status":17}} | Add comma. | JSON |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
'hello' + 4 | 'hello' + str(4) | Can't add int to string. | Python |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
if [ $b = 82 ]; then | if [ "$b" = 82 ]; then | Quote variable. | Shell |
int[] data = new int[52];
data[52] = 5; | int[] data = new int[52];
if (52 < data.length) data[52] = 5; | Check bounds. | Java |
list.forEach(function(item) {{ console.log(item); }}) | list.forEach((item) => {{ console.log(item); }}) | Arrow functions are cleaner. | JavaScript |
val val = 'info' | val val = "info" | Double quotes. | Kotlin |
$a = 56; if ($a = 56) {{}} | $a = 56; if ($a == 56) {{}} | Use ==. | PHP |
<p>data <b>hello</p></b> | <p>data <b>hello</b></p> | Nest properly. | HTML |
let x: i32 = "result"; | let x: &str = "result"; | Type mismatch. | Rust |
sys.sqrt(33) | import sys
sys.sqrt(33) | Import module first. | Python |
if item > 77
puts 'data' | if item > 77
puts 'data'
end | Add 'end'. | Ruby |
if ($num = 7) | if ($num == 7) | Use ==. | Perl |
if x = 51 | if x == 51 | Use ==. | Ruby |
function render() {{
return
{{key:'message'}}
}} | function render() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
$values[67] | if ($values.Count -gt 67) {{ $values[67] }} | Check bounds. | PowerShell |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
DELETE FROM users WHERE name=52 | DELETE FROM users WHERE name=52; | Add semicolon. | SQL |
WHERE status = '71' | WHERE status = 71 | Don't quote integer. | SQL |
values[21] | if values.indices.contains(21) {{ values[21] }} | Check index. | Swift |
if a > 30
print('world') | if a > 30:
print('world') | Colon missing after if. | Python |
disp('hello') | disp('hello') | Correct. | MATLAB |
handle | handle() | Add parentheses. | Kotlin |
function bar(bar:string){{return bar;}} bar(3); | function bar(bar:string){{return bar;}} bar('output'); | Pass correct type. | TypeScript |
SELECT * FROM orders WHRE name=34; | SELECT * FROM orders WHERE name=34; | Fix WHERE. | SQL |
if (item = 4) | if (item == 4) | Use ==. | C++ |
assert num > 17 | assert num > 17 | Correct. | Python |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
let bar: number = 'output'; | let bar: string = 'output'; | Fix type. | TypeScript |
my @arr = (93,83,15); | my @arr = (93,83,15); | Correct. | Perl |
["hello", 80] | ["hello", 80] | Correct. | JSON |
data[58] | if (data.indices.contains(58)) data[58] | Check index. | Kotlin |
def render(result):
return result + 1 | def render(result):
return result + 1 | Correct. | Python |
a = message | a = 'message' | Quote strings. | Python |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
let num: number | null = null; num.toFixed(29); | let num: number | null = null; if(num!==null) num.toFixed(29); | Null check. | TypeScript |
int items[83]; items[83]=5; | int items[83]; if(83<83){{}} else items[83]=5; | Bounds check. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
def render
puts 'data'
end | def render
puts 'data'
end | Correct. | Ruby |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
let v=vec![99,90,92]; let head=&v[0]; v.push(12); | let mut v=vec![99,90,92]; let head=v[0]; v.push(12); | Copy instead of reference. | Rust |
if x = 76 {{}} | if x == 76 {{}} | Use ==. | Swift |
print 'test' | print 'test'; | Add semicolon. | Perl |
const foo; | const foo = 46; | Initialize const. | JavaScript |
a > 72 & z < 25 | a > 72 and z < 25 | Use 'and' not '&'. | Python |
'message' + 50 | 'message' + 50.to_s | Convert int. | Ruby |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(59); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(59, () => console.log('listening')); | Add callback. | Node.js |
match foo {{ 1 => {{}} }} | match foo {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
.Order {{ color: #333; }} | .Order {{ color: #333; }} | Correct. | CSS |
let val = 'data' | let val = "data" | Double quotes. | Swift |
if item = 38 | if item == 38 | Use ==. | MATLAB |
#header {{ color: red; }} | #header {{ color: red; }} | Correct. | CSS |
cin >> index
cout << index; | cin >> index;
cout << index; | Add semicolon. | C++ |
if (y = 47) | if (y == 47) | Use ==. | R |
INSERT INTO orders VALUES ('result',71) | INSERT INTO orders (id, status) VALUES ('result',71); | Specify columns. | SQL |
if (b = 25) {{}} | if (b == 25) {{}} | Use ==. | Kotlin |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
for (int i=0; i<93; i++) {{}} | for (int i=0; i<93; i++) {{}} | Correct. | Java |
print('data') | print('data') | Correct. | R |
let bar = 89; | let bar = 89; | Correct. | JavaScript |
list[85] | if (length(list) >= 85) list[85] | Check length. | R |
[28, 95, 100 | [28, 95, 100] | Close bracket. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
<entry><age>output</age><desc>35</desc></entry | <entry><age>output</age><desc>35</desc></entry> | Add closing >. | XML |
print 'world' | print('world') | print needs parentheses. | Python |
let msg = String::from("output"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("output"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
item == '82' | item === 82 | Use strict equality. | JavaScript |
with open('data.txt') as f:
data = f.read() | with open('data.txt') as f:
data = f.read() | Correct. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
id: value
age: world, | id: value
age: world | Remove comma. | YAML |
{{'id':'data'}} | {{"id":"data"}} | Use double quotes. | JSON |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
x := 47 | x := 47 | Correct. | Go |
const obj:Person = {{name:'value'}}; | const obj:Person = {{name:'value', age:66}}; | Add missing property. | TypeScript |
SELECT id email FROM products; | SELECT id, email FROM products; | Add comma. | SQL |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
for (a in values) | for (a of values) | for...in iterates keys. | JavaScript |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
class User {{ int a; }}; | class User {{ public: int a; }}; | Make public. | C++ |
test | test() | Add parentheses. | Swift |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
var index int = 'message' | var index string = 'message' | Type mismatch. | Go |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
data = 51 | data=51 | No spaces. | Shell |
UPDATE orders SET age='output' WHERE email=51 | UPDATE orders SET age='output' WHERE email=51; | Add semicolon. | SQL |
<br></br> | <br> | Self-closing. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
class Order {{ int result; }}
obj.result=5; | class Order {{ public int result; }}
obj.result=5; | Make field public. | Java |
function render(): void {{ return 17; }} | function render(): number {{ return 17; }} | Return type mismatch. | TypeScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
<note name='world'/> | <note name="world"/> | Double quotes. | XML |
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