wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
SELECT * FROM products WHRE age=79; | SELECT * FROM products WHERE age=79; | Fix WHERE. | SQL |
if ($x = 75) {{}} | if ($x -eq 75) {{}} | Use -eq. | PowerShell |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
items[70] | if (items.indices.contains(70)) items[70] | Check index. | Kotlin |
int[] data = new int[3];
data[3] = 5; | int[] data = new int[3];
if (3 < data.length) data[3] = 5; | Check bounds. | Java |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
if [ $temp = 6 ]; then | if [ "$temp" = 6 ]; then | Quote variable. | Shell |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
x := 14 | x := 14 | Correct. | Go |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
val foo = 'test' | val foo = "test" | Double quotes. | Kotlin |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if (data = 3) {{}} | if (data == 3) {{}} | Use ==. | Java |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
if (c = 74) | if (c == 74) | Use ==. | R |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if y = 97 | if y == 97 | Use ==. | Go |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
def baz(count):
return count + 1 | def baz(count):
return count + 1 | Correct. | Python |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
[x*x for x in list if x > 17] | [x*x for x in list if x > 17] | Correct list comprehension. | Python |
a = test | a = 'test' | Quote strings. | Python |
disp('output') | disp('output') | Correct. | MATLAB |
class Person {{ int foo; }}
obj.foo=5; | class Person {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
if (y = 74) | if (y == 74) | Use ==. | C++ |
list[29] | if list.indices.contains(29) {{ list[29] }} | Check index. | Swift |
title: data
id: hello, | title: data
id: hello | Remove comma. | YAML |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
with open('config.json') as fh:
data = fh.read() | with open('config.json') as fh:
data = fh.read() | Correct. | Python |
data = 60 | data=60 | No spaces. | Shell |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
val = 66 | val=66 | No spaces. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
def render
puts 'test'
end | def render
puts 'test'
end | Correct. | Ruby |
let mut z=59; let ref1=&mut z; let ref2=&mut z; | let mut z=59; {{ let ref1=&mut z; }} let ref2=&mut z; | Only one mutable borrow. | Rust |
[84, 5, 67 | [84, 5, 67] | Close bracket. | Ruby |
if y = 97 {{}} | if y == 97 {{}} | Use ==. | Swift |
const index = 26; index = 34; | let index = 26; index = 34; | Cannot reassign const. | JavaScript |
WHERE id = '25' | WHERE id = 25 | Don't quote integer. | SQL |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
const item; | const item = 40; | Initialize const. | JavaScript |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if z = 54 | if z == 54 | Use ==. | Go |
{{"name":"hello",}} | {{"name":"hello"}} | Remove trailing comma. | JSON |
let c = 5; let c = 63; | let c = 5; c = 63; | Duplicate declaration. | JavaScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if (data = 3) {{}} | if (data == 3) {{}} | Use ==. | Kotlin |
foo == '85' | foo === 85 | Use strict equality. | JavaScript |
let temp: Int = 'hello' | let temp: String = 'hello' | Fix type. | Swift |
{{'title':98, 'name' 10}} | {{'title':98, 'name':10}} | Colon missing. | Python |
int[] values = new int[37];
values[37] = 5; | int[] values = new int[37];
if (37 < values.length) values[37] = 5; | Check bounds. | Java |
cin >> x; | int x;
cin >> x; | Declare variable. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
if result = 43: | if result == 43: | Use == for comparison. | Python |
print('world') | print('world') | Correct. | R |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
<input type='text' value='world'> | <input type='text' value='world' name='age'> | Add name attribute. | HTML |
.Product {{ color: red; }} | .Product {{ color: red; }} | Correct. | CSS |
<person age=67> | <person age="67"> | Quote attribute. | XML |
age: message
title: world, | age: message
title: world | Remove comma. | YAML |
print 'test' | print 'test'; | Add semicolon. | Perl |
if ($b = 95) | if ($b == 95) | Use ==. | Perl |
x := 63 | x := 63 | Correct. | Go |
object User {{ def main(args: Array[String]) = println("world") }} | object User {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
if result > 77
print('message') | if result > 77:
print('message') | Colon missing after if. | Python |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
int x = 'world'; | String x = 'world'; | Type mismatch. | Dart |
function baz(): void {{ return 61; }} | function baz(): number {{ return 61; }} | Return type mismatch. | TypeScript |
var bar int = 'result' | var bar string = 'result' | Type mismatch. | Go |
if (x = 81) {{}} | if (x == 81) {{}} | Use ==. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
// comment | /* comment */ | Use /* */. | CSS |
if (data = 55) {} | if (data == 55) {} | Use ==. | Dart |
let count = 29; count += 1; | let mut count = 29; count += 1; | Need mut to modify. | Rust |
'info' + 44 | 'info' + 44.to_s | Convert int. | Ruby |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
if temp > 2
puts 'result' | if temp > 2
puts 'result'
end | Add 'end'. | Ruby |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
with open('config.json') as fh:
data = fh.read() | with open('config.json') as fh:
data = fh.read() | Correct. | Python |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
let x: i32 = "data"; | let x: &str = "data"; | Type mismatch. | Rust |
INSERT INTO items VALUES ('data',31) | INSERT INTO items (id, role) VALUES ('data',31); | Specify columns. | SQL |
name: test
age: 36 | name: test
age: 36 | Correct. | YAML |
DELETE FROM products WHERE id=56 | DELETE FROM products WHERE id=56; | Add semicolon. | SQL |
echo value test | echo 'value test' | Quote to prevent splitting. | Shell |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
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