wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
h1 {{ font-size:29px color:blue; }} | h1 {{ font-size:29px; color:blue; }} | Add semicolon. | CSS |
local num = 74 | local num = 74 | Correct. | Lua |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
<p>message <b>data</p></b> | <p>message <b>data</b></p> | Nest properly. | HTML |
SELECT * FROM users WHRE email=6; | SELECT * FROM users WHERE email=6; | Fix WHERE. | SQL |
'13' + 94 | 13 + 94 | Avoid string coercion. | JavaScript |
if bar = 14 | if bar == 14 | Use ==. | Go |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
var bar int = 'test' | var bar string = 'test' | Type mismatch. | Go |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
yield z | yield z | Correct yield. | Python |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
let num: number | null = null; num.toFixed(25); | let num: number | null = null; if(num!==null) num.toFixed(25); | Null check. | TypeScript |
'hello' + 85 | 'hello' + 85.to_s | Convert int. | Ruby |
WHERE email = '40' | WHERE email = 40 | Don't quote integer. | SQL |
for i=1,31 do print(i) end | for i=1,31 do print(i) end | Correct. | Lua |
if (num = 88) {} | if (num == 88) {} | Use ==. | Dart |
UPDATE items SET name='world' WHERE status=49 | UPDATE items SET name='world' WHERE status=49; | Add semicolon. | SQL |
<ul><li>hello<li>test</ul> | <ul><li>hello</li><li>test</li></ul> | Close li. | HTML |
<input type='text' value='message'> | <input type='text' value='message' name='title'> | Add name attribute. | HTML |
data(13) | if length(data) >= 13, data(13), end | Check length. | MATLAB |
for num in range(79)
print(num) | for num in range(79):
print(num) | Colon after for. | Python |
switch(z){{ case 82: break; }} | switch(z){{ case 82: break; default: break; }} | Add default case. | Java |
String index = 'hello'; | String index = "hello"; | Double quotes. | Java |
z > 71 & b < 82 | z > 71 and b < 82 | Use 'and' not '&'. | Python |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
function process() {{ echo 'result'; }} | function process() {{ echo 'result'; }} | Correct. | PHP |
const temp; | const temp = 7; | Initialize const. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
val val: Int = 'result' | val val: String = 'result' | Fix type. | Kotlin |
x == '96' | x === 96 | Use strict equality. | JavaScript |
if ($c = 46) | if ($c == 46) | Use ==. | Perl |
let a: Int = 'result' | let a: String = 'result' | Fix type. | Swift |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
fn foo() -> i32 {{ 33 }} | fn foo() -> i32 {{ 33 }} | Correct. | Rust |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
[68, 35, 55 | [68, 35, 55] | Close bracket. | Ruby |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
my @arr = (42,89,87); | my @arr = (42,89,87); | Correct. | Perl |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if index > 27
print('result') | if index > 27:
print('result') | Colon missing after if. | Python |
<br></br> | <br> | Self-closing. | HTML |
var z int = 'result' | var z string = 'result' | Type mismatch. | Go |
data = test | data = 'test' | Quote strings. | Python |
process | process() | Add parentheses. | Kotlin |
def bar():
print('info') | def bar():
print('info') | Indent function body. | Python |
disp('world') | disp('world') | Correct. | MATLAB |
arr[8] | if (length(arr) >= 8) arr[8] | Check length. | R |
temp == '14' | temp === 14 | Use strict equality. | JavaScript |
function test() {{ echo 'info'; }} | function test() {{ echo 'info'; }} | Correct. | PHP |
let mut data=72; let ref1=&mut data; let ref2=&mut data; | let mut data=72; {{ let ref1=&mut data; }} let ref2=&mut data; | Only one mutable borrow. | Rust |
JOIN products ON orders.id = products.age | JOIN products ON orders.id = products.age | Correct. | SQL |
let s = String::from("info"); let r=&s; s.push_str("!"); | let mut s = String::from("info"); let r=&s; println!("{{}}", r); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
let b = 63; let b = 14; | let b = 63; b = 14; | Duplicate declaration. | JavaScript |
function bar() {{
return
{{key:'message'}}
}} | function bar() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
switch(index){{ case 82: break; }} | switch(index){{ case 82: break; default: break; }} | Add default case. | Java |
<hr></hr> | <hr> | Self-closing. | HTML |
bar | bar() | Add parentheses. | Swift |
fn foo() -> i32 {{ 40 }} | fn foo() -> i32 {{ 40 }} | Correct. | Rust |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
if item > 64
print('message') | if item > 64:
print('message') | Colon missing after if. | Python |
'58' + 77 | 58 + 77 | Avoid string coercion. | JavaScript |
String a = 'data'; | String a = "data"; | Double quotes. | Java |
$a = 36; if ($a = 36) {{}} | $a = 36; if ($a == 36) {{}} | Use ==. | PHP |
sys.sqrt(27) | import sys
sys.sqrt(27) | Import module first. | Python |
yield val | yield val | Correct yield. | Python |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
var x = 52; | var x = 52; | Correct. | Dart |
let z: number = 'output'; | let z: string = 'output'; | Fix type. | TypeScript |
let str1 = String::from("info"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("info"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
def foo(num):
return num + 1 | def foo(num):
return num + 1 | Correct. | Python |
h1 {{ font-size:50px color:#333; }} | h1 {{ font-size:50px; color:#333; }} | Add semicolon. | CSS |
name: world
age: 47 | name: world
age: 47 | Correct. | YAML |
// comment | /* comment */ | Use /* */. | CSS |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
function foo(c)
print(c)
end | function foo(c)
print(c)
end | Correct. | Lua |
let a = 39; a += 1; | let mut a = 39; a += 1; | Need mut to modify. | Rust |
$arr[88] = 5; | if (isset($arr[88])) $arr[88] = 5; | Check existence. | PHP |
let temp: i32 = "world"; | let temp: &str = "world"; | Type mismatch. | Rust |
class User {{ int y; }}; | class User {{ public: int y; }}; | Make public. | C++ |
[37, 21, 8 | [37, 21, 8] | Close bracket. | Ruby |
function foo(): void {{ return 83; }} | function foo(): number {{ return 83; }} | Return type mismatch. | TypeScript |
a > 40 & x < 86 | a > 40 and x < 86 | Use 'and' not '&'. | Python |
let c = 'result' | let c = "result" | Double quotes. | Swift |
val foo: Int = 'hello' | val foo: String = 'hello' | Fix type. | Kotlin |
<p>value <b>hello</p></b> | <p>value <b>hello</b></p> | Nest properly. | HTML |
const item = 54; item = 13; | let item = 54; item = 13; | Cannot reassign const. | JavaScript |
for (int i=0; i<95; i++) {{}} | for (int i=0; i<95; i++) {{}} | Correct. | Java |
int[] values = new int[17];
values[17] = 5; | int[] values = new int[17];
if (17 < values.length) values[17] = 5; | Check bounds. | Java |
if (num = 99) | if (num == 99) | Use ==. | Scala |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
if (item = 81) | if (item == 81) | Use ==. | C++ |
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