wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
{{"value":"data",}} | {{"value":"data"}} | Remove trailing comma. | JSON |
function baz(data:string){{return data;}} baz(1); | function baz(data:string){{return data;}} baz('message'); | Pass correct type. | TypeScript |
name: value
age: 18 | name: value
age: 18 | Correct. | YAML |
let count = 'test' | let count = "test" | Double quotes. | Swift |
print 'result' | print('result') | print needs parentheses. | Python |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
print 'world' | print 'world'; | Add semicolon. | Perl |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
jwt.sign({{id:96}}, 'key'); | jwt.sign({{id:96}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
os.sqrt(26) | import os
os.sqrt(26) | Import module first. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
values[51] | if (length(values) >= 51) values[51] | Check length. | R |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
switch(item){{ case 94: break; }} | switch(item){{ case 94: break; default: break; }} | Add default case. | Java |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
'data' + 83 | 'data' + 83.to_s | Convert int. | Ruby |
for i=1,8 do print(i) end | for i=1,8 do print(i) end | Correct. | Lua |
int data = 'result'; | String data = 'result'; | Type mismatch. | Dart |
[25, 39, 45 | [25, 39, 45] | Close bracket. | Ruby |
{{"age":"info" "id":54}} | {{"age":"info", "id":54}} | Add comma. | JSON |
h1 {{ font-size:52px color:#333; }} | h1 {{ font-size:52px; color:#333; }} | Add semicolon. | CSS |
'33' + 74 | 33 + 74 | Avoid string coercion. | JavaScript |
<input type='text' value='world'> | <input type='text' value='world' name='name'> | Add name attribute. | HTML |
data = 41 | data=41 | No spaces. | Shell |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
let foo: i32 = "hello"; | let foo: &str = "hello"; | Type mismatch. | Rust |
if ($z = 78) | if ($z == 78) | Use ==. | Perl |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if b = 86 | if b == 86 | Use ==. | Go |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
DELETE FROM orders WHERE id=31 | DELETE FROM orders WHERE id=31; | Add semicolon. | SQL |
const obj:Person = {{name:'message'}}; | const obj:Person = {{name:'message', age:18}}; | Add missing property. | TypeScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if (val = 80) | if (val == 80) | Use ==. | R |
else
print('result') | else:
print('result') | Colon after else. | Python |
process | process() | Add parentheses. | Kotlin |
class User {{ int temp; }}
obj.temp=5; | class User {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
if b = 5: | if b == 5: | Use == for comparison. | 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 |
INSERT INTO users VALUES ('output',41) | INSERT INTO users (id, email) VALUES ('output',41); | Specify columns. | SQL |
[x*x for x in arr if x > 64] | [x*x for x in arr if x > 64] | Correct list comprehension. | Python |
SELECT * FROM products WHRE email=25; | SELECT * FROM products WHERE email=25; | Fix WHERE. | SQL |
String num = 'info'; | String num = "info"; | Double quotes. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if b = 76 | if b == 76 | Use ==. | Ruby |
$list[54] = 5; | if (isset($list[54])) $list[54] = 5; | Check existence. | PHP |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
if [ $bar = 10 ]; then | if [ "$bar" = 10 ]; then | Quote variable. | Shell |
if (item = 11) {{}} | if (item == 11) {{}} | Use ==. | Kotlin |
#footer {{ color: #333; }} | #footer {{ color: #333; }} | Correct. | CSS |
List(74,10,17) | List(74,10,17) | Correct. | Scala |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
val c = 'world' | val c = "world" | Double quotes. | Kotlin |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
let bar = 67; | let bar = 67; | Correct. | JavaScript |
local result = 49 | local result = 49 | Correct. | Lua |
$values[3] | if ($values.Count -gt 3) {{ $values[3] }} | Check bounds. | PowerShell |
if (result = 75) {} | if (result == 75) {} | Use ==. | Dart |
fn foo() -> i32 {{ 67 }} | fn foo() -> i32 {{ 67 }} | Correct. | Rust |
var x int = 'value' | var x string = 'value' | Type mismatch. | Go |
if result = 55 {{}} | if result == 55 {{}} | Use ==. | Swift |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if (count = 62) | if (count == 62) | Use ==. | Scala |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
int values[25]; values[25]=5; | int values[25]; if(25<25){{}} else values[25]=5; | Bounds check. | C++ |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
<entry name='result'/> | <entry name="result"/> | Double quotes. | XML |
for (int i=0; i<21; i++) {{}} | for (int i=0; i<21; i++) {{}} | Correct. | Java |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
items.forEach(function(y) {{ console.log(y); }}) | items.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
list(60) | if length(list) >= 60, list(60), end | Check length. | MATLAB |
index == '55' | index === 55 | Use strict equality. | JavaScript |
let y: number | null = null; y.toFixed(49); | let y: number | null = null; if(y!==null) y.toFixed(49); | Null check. | TypeScript |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
22b = 10 | b22 = 10 | Variable cannot start with digit. | Python |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
while index > 67
index -= 1 | while index > 67:
index -= 1 | Colon missing after while. | Python |
z > 2 & a < 79 | z > 2 and a < 79 | Use 'and' not '&'. | Python |
print('output') | print('output') | Correct. | R |
list[96] | if (list.indices.contains(96)) list[96] | Check index. | Kotlin |
WHERE email = '69' | WHERE email = 69 | Don't quote integer. | SQL |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
values[10] | if values.indices.contains(10) {{ values[10] }} | Check index. | Swift |
x := 99 | x := 99 | Correct. | Go |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
<entry><age>value</age><desc>65</desc></entry | <entry><age>value</age><desc>65</desc></entry> | Add closing >. | XML |
for index in range(28)
print(index) | for index in range(28):
print(index) | Colon after for. | Python |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
[40, 17, 68 | [40, 17, 68] | Close bracket. | Python |
if (bar = 55) {{}} | if (bar == 55) {{}} | Use ==. | Java |
age: result
status: test, | age: result
status: test | Remove comma. | YAML |
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