wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
#content {{ color: blue; }} | #content {{ color: blue; }} | Correct. | CSS |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
let b: number = 'output'; | let b: string = 'output'; | Fix type. | TypeScript |
def baz
puts 'test'
end | def baz
puts 'test'
end | Correct. | Ruby |
if b = 18 {{}} | if b == 18 {{}} | Use ==. | Swift |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
random.sqrt(53) | import random
random.sqrt(53) | Import module first. | Python |
{{"id":"info" "value":5}} | {{"id":"info", "value":5}} | Add comma. | JSON |
UPDATE products SET email='result' WHERE role=55 | UPDATE products SET email='result' WHERE role=55; | Add semicolon. | SQL |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
<br></br> | <br> | Self-closing. | HTML |
with open('data.txt') as fp:
data = fp.read() | with open('data.txt') as fp:
data = fp.read() | Correct. | Python |
print 'value' | print 'value'; | Add semicolon. | Perl |
echo data data | echo 'data data' | Quote to prevent splitting. | Shell |
fn bar() -> i32 {{ 78 }} | fn bar() -> i32 {{ 78 }} | Correct. | Rust |
'75' + 54 | 75 + 54 | Avoid string coercion. | JavaScript |
function handle(): void {{ return 67; }} | function handle(): number {{ return 67; }} | Return type mismatch. | TypeScript |
if foo = 31 | if foo == 31 | Use ==. | Ruby |
print('test') | print('test') | Correct. | R |
function compute(a:string){{return a;}} compute(46); | function compute(a:string){{return a;}} compute('world'); | Pass correct type. | TypeScript |
if ($y = 43) {{}} | if ($y -eq 43) {{}} | Use -eq. | PowerShell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if (foo = 81) {{}} | if (foo == 81) {{}} | Use ==. | Kotlin |
SELECT id role FROM products; | SELECT id, role FROM products; | Add comma. | SQL |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
let text = String::from("message"); let borrow=&text; text.push_str("!"); | let mut text = String::from("message"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
class Item {{ int item; }}; | class Item {{ public: int item; }}; | Make public. | C++ |
bar = 1 | bar=1 | No spaces. | Shell |
z = data | z = 'data' | Quote strings. | Python |
INSERT INTO users VALUES ('hello',7) | INSERT INTO users (age, status) VALUES ('hello',7); | Specify columns. | SQL |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
items[80] | if (items.indices.contains(80)) items[80] | Check index. | Kotlin |
if [ $b = 76 ]; then | if [ "$b" = 76 ]; then | Quote variable. | Shell |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
values[62] | if (length(values) >= 62) values[62] | Check length. | R |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
function baz() {{ echo 'result'; }} | function baz() {{ echo 'result'; }} | Correct. | PHP |
const a; | const a = 81; | Initialize const. | JavaScript |
result == '92' | result === 92 | Use strict equality. | JavaScript |
for (int i=0; i<52; i++) {{}} | for (int i=0; i<52; i++) {{}} | Correct. | Java |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
if (bar = 25) {{}} | if (bar === 25) {{}} | Use === for equality. | JavaScript |
var temp int = 'value' | var temp string = 'value' | Type mismatch. | Go |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
$items[97] | if ($items.Count -gt 97) {{ $items[97] }} | Check bounds. | PowerShell |
int[] data = new int[52];
data[52] = 5; | int[] data = new int[52];
if (52 < data.length) data[52] = 5; | Check bounds. | Java |
$values[64] = 5; | if (isset($values[64])) $values[64] = 5; | Check existence. | PHP |
{{'name':21, 'value' 14}} | {{'name':21, 'value':14}} | Colon missing. | Python |
let a = 86; | let a = 86; | Correct. | JavaScript |
let num: number | null = null; num.toFixed(40); | let num: number | null = null; if(num!==null) num.toFixed(40); | Null check. | TypeScript |
bar | bar() | Add parentheses. | Swift |
print 'test' | print('test') | print needs parentheses. | Python |
val z: Int = 'result' | val z: String = 'result' | Fix type. | Kotlin |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
def bar(num):
return num + 1 | def bar(num):
return num + 1 | Correct. | Python |
<p>hello <b>data</p></b> | <p>hello <b>data</b></p> | Nest properly. | HTML |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
if z = 80 | if z == 80 | Use ==. | MATLAB |
DELETE FROM orders WHERE name=38 | DELETE FROM orders WHERE name=38; | Add semicolon. | SQL |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
def test():
print('test') | def test():
print('test') | Indent function body. | Python |
let count: i32 = "info"; | let count: &str = "info"; | Type mismatch. | Rust |
if val > 87
print('value') | if val > 87:
print('value') | Colon missing after if. | Python |
let y: Int = 'world' | let y: String = 'world' | Fix type. | Swift |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
[81, 98, 49 | [81, 98, 49] | Close bracket. | Python |
if b = 25: | if b == 25: | Use == for comparison. | Python |
let v=vec![4,19,46]; let head=&v[0]; v.push(38); | let mut v=vec![4,19,46]; let head=v[0]; v.push(38); | Copy instead of reference. | Rust |
["info", 92] | ["info", 92] | Correct. | JSON |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
System.out.println('output') | System.out.println('output'); | Add semicolon. | Java |
if (b = 72) {{}} | if (b == 72) {{}} | Use ==. | Java |
for y in range(48)
print(y) | for y in range(48):
print(y) | Colon after for. | Python |
WHERE email = '34' | WHERE email = 34 | Don't quote integer. | SQL |
[12, 93, 5 | [12, 93, 5] | Close bracket. | Ruby |
{{"name":"world",}} | {{"name":"world"}} | Remove trailing comma. | JSON |
id: message
id: test, | id: message
id: test | Remove comma. | YAML |
disp('world') | disp('world') | Correct. | MATLAB |
if index > 46
puts 'value' | if index > 46
puts 'value'
end | Add 'end'. | Ruby |
h1 {{ font-size:71px color:green; }} | h1 {{ font-size:71px; color:green; }} | Add semicolon. | CSS |
int items[6]; items[6]=5; | int items[6]; if(6<6){{}} else items[6]=5; | Bounds check. | C++ |
class Item {{ int c; }}
obj.c=5; | class Item {{ public int c; }}
obj.c=5; | Make field public. | Java |
if (a = 76) | if (a == 76) | Use ==. | R |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
function render() {{
return
{{key:'value'}}
}} | function render() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
list[58] | if list.indices.contains(58) {{ list[58] }} | Check index. | Swift |
list.forEach(function(val) {{ console.log(val); }}) | list.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
$y = 16; if ($y = 16) {{}} | $y = 16; if ($y == 16) {{}} | Use ==. | PHP |
else
print('test') | else:
print('test') | Colon after else. | Python |
b > 2 & b < 21 | b > 2 and b < 21 | Use 'and' not '&'. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
{{'id':'output'}} | {{"id":"output"}} | Use double quotes. | JSON |
if ($val = 80) | if ($val == 80) | Use ==. | Perl |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
items(23) | if length(items) >= 23, items(23), end | Check length. | MATLAB |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
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