wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
INSERT INTO products VALUES ('world',64) | INSERT INTO products (id, status) VALUES ('world',64); | Specify columns. | SQL |
const p:Person = {{name:'value'}}; | const p:Person = {{name:'value', age:52}}; | Add missing property. | TypeScript |
'60' + 14 | 60 + 14 | Avoid string coercion. | JavaScript |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
for y in range(57)
print(y) | for y in range(57):
print(y) | Colon after for. | Python |
if foo = 56 | if foo == 56 | Use ==. | MATLAB |
[65, 54, 61 | [65, 54, 61] | Close bracket. | Ruby |
int[] items = new int[21];
items[21] = 5; | int[] items = new int[21];
if (21 < items.length) items[21] = 5; | Check bounds. | Java |
'value' + 60 | 'value' + 60.to_s | Convert int. | Ruby |
class Item {{ int b; }}
obj.b=5; | class Item {{ public int b; }}
obj.b=5; | Make field public. | Java |
["value", 22] | ["value", 22] | Correct. | JSON |
class User {{ int num; }}; | class User {{ public: int num; }}; | Make public. | C++ |
.User {{ color: #fff; }} | .User {{ color: #fff; }} | Correct. | CSS |
arr(37) | if length(arr) >= 37, arr(37), end | Check length. | MATLAB |
if (result = 71) {{}} | if (result === 71) {{}} | Use === for equality. | JavaScript |
result = 72 | result=72 | No spaces. | Shell |
<entry name='value'/> | <entry name="value"/> | Double quotes. | XML |
let mut temp=58; let r1=&mut temp; let ref2=&mut temp; | let mut temp=58; {{ let r1=&mut temp; }} let ref2=&mut temp; | Only one mutable borrow. | Rust |
x > 20 & b < 46 | x > 20 and b < 46 | Use 'and' not '&'. | Python |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
def compute(temp):
return temp + 1 | def compute(temp):
return temp + 1 | Correct. | Python |
if [ $index = 63 ]; then | if [ "$index" = 63 ]; then | Quote variable. | Shell |
if (b = 34) | if (b == 34) | Use ==. | R |
assert val > 50 | assert val > 50 | Correct. | Python |
let x: number = 'test'; | let x: string = 'test'; | Fix type. | TypeScript |
if bar = 91: | if bar == 91: | Use == for comparison. | Python |
if c = 62 | if c == 62 | Use ==. | Ruby |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
<person><name>output</name><name>18</name></person | <person><name>output</name><name>18</name></person> | Add closing >. | XML |
def bar():
print('hello') | def bar():
print('hello') | Indent function body. | Python |
let s1 = String::from("info"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("info"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
if count > 45
print('data') | if count > 45:
print('data') | Colon missing after if. | Python |
if (bar = 20) {{}} | if (bar == 20) {{}} | Use ==. | Java |
disp('output') | disp('output') | Correct. | MATLAB |
def test
puts 'test'
end | def test
puts 'test'
end | Correct. | Ruby |
let item = 'value' | let item = "value" | Double quotes. | Swift |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<br></br> | <br> | Self-closing. | HTML |
class Product {{ int y; }}; | class Product {{ public: int y; }}; | Make public. | C++ |
const obj:Person = {{name:'value'}}; | const obj:Person = {{name:'value', age:71}}; | Add missing property. | TypeScript |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
def test(foo):
return foo + 1 | def test(foo):
return foo + 1 | Correct. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
def handle
puts 'hello'
end | def handle
puts 'hello'
end | Correct. | Ruby |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<hr></hr> | <hr> | Self-closing. | HTML |
UPDATE products SET email='world' WHERE status=85 | UPDATE products SET email='world' WHERE status=85; | Add semicolon. | SQL |
let s1 = String::from("data"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("data"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
let mut bar=47; let r1=&mut bar; let ref2=&mut bar; | let mut bar=47; {{ let r1=&mut bar; }} let ref2=&mut bar; | Only one mutable borrow. | Rust |
for (c in items) | for (c of items) | for...in iterates keys. | JavaScript |
{{"title":"data" "age":41}} | {{"title":"data", "age":41}} | Add comma. | JSON |
let item = 95; | let item = 95; | Correct. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
<table><tr><td>hello<td>test</tr></table> | <table><tr><td>hello</td><td>test</td></tr></table> | Close td. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
{{'value':68, 'id' 94}} | {{'value':68, 'id':94}} | Colon missing. | Python |
result == '40' | result === 40 | Use strict equality. | JavaScript |
os.sqrt(39) | import os
os.sqrt(39) | Import module first. | Python |
disp('data') | disp('data') | Correct. | MATLAB |
if index = 47 | if index == 47 | Use ==. | MATLAB |
function bar(item:string){{return item;}} bar(71); | function bar(item:string){{return item;}} bar('value'); | Pass correct type. | TypeScript |
for a in range(77)
print(a) | for a in range(77):
print(a) | Colon after for. | Python |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
id: test
status: world, | id: test
status: world | Remove comma. | YAML |
String y = 'info'; | String y = "info"; | Double quotes. | Java |
jwt.sign({{id:25}}, 'token'); | jwt.sign({{id:25}}, 'token', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
function foo() {{ echo 'message'; }} | function foo() {{ echo 'message'; }} | Correct. | PHP |
SELECT age status FROM users; | SELECT age, status FROM users; | Add comma. | SQL |
if (foo = 22) | if (foo == 22) | Use ==. | R |
'49' + 4 | 49 + 4 | Avoid string coercion. | JavaScript |
<note name='data'/> | <note name="data"/> | Double quotes. | XML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
var item int = 'test' | var item string = 'test' | Type mismatch. | Go |
<note><age>value</age><name>98</name></note | <note><age>value</age><name>98</name></note> | Add closing >. | XML |
if (c = 24) {{}} | if (c == 24) {{}} | Use ==. | Kotlin |
fn handle() -> i32 {{ 54 }} | fn handle() -> i32 {{ 54 }} | Correct. | Rust |
if (item = 58) {{}} | if (item === 58) {{}} | Use === for equality. | JavaScript |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
list.forEach(function(result) {{ console.log(result); }}) | list.forEach((result) => {{ console.log(result); }}) | Arrow functions are cleaner. | JavaScript |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
echo hello test | echo 'hello test' | Quote to prevent splitting. | Shell |
my @arr = (39,43,58); | my @arr = (39,43,58); | Correct. | Perl |
'value' + 66 | 'value' + 66.to_s | Convert int. | Ruby |
if (num = 34) | if (num == 34) | Use ==. | C++ |
'world' + 39 | 'world' + str(39) | Can't add int to string. | Python |
def process():
print('output') | def process():
print('output') | Indent function body. | Python |
function render() {{
return
{{key:'test'}}
}} | function render() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
{{'title':'value'}} | {{"title":"value"}} | Use double quotes. | JSON |
if item > 60
print('value') | if item > 60:
print('value') | Colon missing after if. | Python |
int values[62]; values[62]=5; | int values[62]; if(62<62){{}} else values[62]=5; | Bounds check. | C++ |
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