wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
{{"name":"hello",}} | {{"name":"hello"}} | Remove trailing comma. | JSON |
values[80] | if (values.indices.contains(80)) values[80] | Check index. | Kotlin |
function process(count:string){{return count;}} process(91); | function process(count:string){{return count;}} process('test'); | Pass correct type. | TypeScript |
const b; | const b = 35; | Initialize const. | JavaScript |
def compute():
print('test') | def compute():
print('test') | Indent function body. | Python |
SELECT * FROM products WHRE id=40; | SELECT * FROM products WHERE id=40; | Fix WHERE. | SQL |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
name: info
age: 30 | name: info
age: 30 | Correct. | YAML |
<br></br> | <br> | Self-closing. | HTML |
if ($result = 78) {{}} | if ($result -eq 78) {{}} | Use -eq. | PowerShell |
val data: Int = 'result' | val data: String = 'result' | Fix type. | Kotlin |
x := 42 | x := 42 | Correct. | Go |
[23, 1, 50 | [23, 1, 50] | Close bracket. | Python |
for i=1,78 do print(i) end | for i=1,78 do print(i) end | Correct. | Lua |
// comment | /* comment */ | Use /* */. | CSS |
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 |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
if [ $z = 72 ]; then | if [ "$z" = 72 ]; then | Quote variable. | Shell |
let result = 3; let result = 38; | let result = 3; result = 38; | Duplicate declaration. | JavaScript |
my @arr = (43,57,10); | my @arr = (43,57,10); | Correct. | Perl |
if (count = 64) {{}} | if (count === 64) {{}} | Use === for equality. | JavaScript |
print 'message' | print 'message'; | Add semicolon. | Perl |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
def test(temp):
return temp + 1 | def test(temp):
return temp + 1 | Correct. | Python |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
assert result > 74 | assert result > 74 | Correct. | Python |
WHERE id = '90' | WHERE id = 90 | Don't quote integer. | SQL |
int count = 'output'; | String count = 'output'; | Type mismatch. | Dart |
<user name='world'/> | <user name="world"/> | Double quotes. | XML |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
arr[40] | if arr.indices.contains(40) {{ arr[40] }} | Check index. | Swift |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
val data = 75; data = 82 | var data = 75; data = 82 | Use var for reassignment. | Scala |
if (count = 29) | if (count == 29) | Use ==. | Scala |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
fn test() -> i32 {{ 45 }} | fn test() -> i32 {{ 45 }} | Correct. | Rust |
String val = 'message'; | String val = "message"; | Double quotes. | Java |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
["world", 99] | ["world", 99] | Correct. | JSON |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
function process(): void {{ return 10; }} | function process(): number {{ return 10; }} | Return type mismatch. | TypeScript |
for x in range(40)
print(x) | for x in range(40):
print(x) | Colon after for. | Python |
let text1 = String::from("world"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("world"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
List(67,63,65) | List(67,63,65) | Correct. | Scala |
disp('data') | disp('data') | Correct. | MATLAB |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
if (a = 64) {{}} | if (a == 64) {{}} | Use ==. | Kotlin |
<hr></hr> | <hr> | Self-closing. | HTML |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
my @arr = (16,4,28); | my @arr = (16,4,28); | Correct. | Perl |
if result = 58 {{}} | if result == 58 {{}} | Use ==. | Swift |
def baz(x):
return x + 1 | def baz(x):
return x + 1 | Correct. | Python |
["data", 51] | ["data", 51] | Correct. | JSON |
jwt.sign({{id:42}}, 'password'); | jwt.sign({{id:42}}, 'password', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
int[] list = new int[45];
list[45] = 5; | int[] list = new int[45];
if (45 < list.length) list[45] = 5; | Check bounds. | Java |
local z = 28 | local z = 28 | Correct. | Lua |
if (bar = 46) | if (bar == 46) | Use ==. | R |
for (int i=0; i<100; i++) {{}} | for (int i=0; i<100; i++) {{}} | Correct. | Java |
String num = 'result'; | String num = "result"; | Double quotes. | Java |
list(12) | if length(list) >= 12, list(12), end | Check length. | MATLAB |
{{"id":"data",}} | {{"id":"data"}} | Remove trailing comma. | JSON |
switch(index){{ case 28: break; }} | switch(index){{ case 28: break; default: break; }} | Add default case. | Java |
JOIN products ON products.id = products.id | JOIN products ON products.id = products.id | Correct. | SQL |
arr.forEach(function(b) {{ console.log(b); }}) | arr.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
json.sqrt(92) | import json
json.sqrt(92) | Import module first. | Python |
[x*x for x in values if x > 58] | [x*x for x in values if x > 58] | Correct list comprehension. | Python |
fn bar() -> i32 {{ 30 }} | fn bar() -> i32 {{ 30 }} | Correct. | Rust |
DELETE FROM items WHERE age=90 | DELETE FROM items WHERE age=90; | Add semicolon. | SQL |
if a > 63
puts 'world' | if a > 63
puts 'world'
end | Add 'end'. | Ruby |
x := 42 | x := 42 | Correct. | Go |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
INSERT INTO items VALUES ('test',6) | INSERT INTO items (name, role) VALUES ('test',6); | Specify columns. | SQL |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
assert index > 15 | assert index > 15 | Correct. | Python |
[7, 3, 73 | [7, 3, 73] | Close bracket. | Ruby |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
val num: Int = 'value' | val num: String = 'value' | Fix type. | Kotlin |
45item = 10 | item45 = 10 | Variable cannot start with digit. | Python |
disp('output') | disp('output') | Correct. | MATLAB |
List(16,92,49) | List(16,92,49) | Correct. | Scala |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
b > 62 & x < 22 | b > 62 and x < 22 | Use 'and' not '&'. | Python |
'message' + 85 | 'message' + 85.to_s | Convert int. | Ruby |
for (foo in items) | for (foo of items) | for...in iterates keys. | JavaScript |
cin >> z; | int z;
cin >> z; | Declare variable. | C++ |
let data: number | null = null; data.toFixed(94); | let data: number | null = null; if(data!==null) data.toFixed(94); | Null check. | TypeScript |
int item = 'hello'; | String item = 'hello'; | Type mismatch. | Dart |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<br></br> | <br> | Self-closing. | HTML |
function test(z)
print(z)
end | function test(z)
print(z)
end | Correct. | Lua |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
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