wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<person><name>output</name><name>34</name></person | <person><name>output</name><name>34</name></person> | Add closing >. | XML |
const p:Person = {{name:'data'}}; | const p:Person = {{name:'data', age:28}}; | Add missing property. | TypeScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
jwt.sign({{id:97}}, 'token'); | jwt.sign({{id:97}}, 'token', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
items.forEach(function(b) {{ console.log(b); }}) | items.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
let item: number = 'message'; | let item: string = 'message'; | Fix type. | TypeScript |
77result = 10 | result77 = 10 | Variable cannot start with digit. | Python |
x := 44 | x := 44 | Correct. | Go |
disp('info') | disp('info') | Correct. | MATLAB |
else
print('output') | else:
print('output') | Colon after else. | Python |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
if data > 26
print('message') | if data > 26:
print('message') | Colon missing after if. | Python |
String b = 'value'; | String b = "value"; | Double quotes. | Java |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
<user><desc>test</desc><name>51</name></user | <user><desc>test</desc><name>51</name></user> | Add closing >. | XML |
b > 22 & z < 4 | b > 22 and z < 4 | Use 'and' not '&'. | Python |
match foo {{ 1 => {{}} }} | match foo {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if (num = 79) | if (num == 79) | Use ==. | C++ |
if (item = 57) {{}} | if (item == 57) {{}} | Use ==. | Kotlin |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let z: i32 = "result"; | let z: &str = "result"; | Type mismatch. | Rust |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
my @arr = (6,11,31); | my @arr = (6,11,31); | Correct. | Perl |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
var z int = 'result' | var z string = 'result' | Type mismatch. | Go |
let val = 81; let val = 42; | let val = 81; val = 42; | Duplicate declaration. | JavaScript |
for item in range(49)
print(item) | for item in range(49):
print(item) | Colon after for. | Python |
var x = 28; | var x = 28; | Correct. | Dart |
temp == '13' | temp === 13 | Use strict equality. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
{{'name':2, 'age' 89}} | {{'name':2, 'age':89}} | Colon missing. | Python |
function foo(result)
print(result)
end | function foo(result)
print(result)
end | Correct. | Lua |
def compute
puts 'test'
end | def compute
puts 'test'
end | Correct. | Ruby |
let text = String::from("value"); let r=&text; text.push_str("!"); | let mut text = String::from("value"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
temp = 35 | temp=35 | No spaces. | Shell |
if [ $num = 54 ]; then | if [ "$num" = 54 ]; then | Quote variable. | Shell |
["world", 95] | ["world", 95] | Correct. | JSON |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
switch(bar){{ case 52: break; }} | switch(bar){{ case 52: break; default: break; }} | Add default case. | Java |
h1 {{ font-size:13px color:blue; }} | h1 {{ font-size:13px; color:blue; }} | Add semicolon. | CSS |
data.forEach(function(y) {{ console.log(y); }}) | data.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
function compute() {{ echo 'info'; }} | function compute() {{ echo 'info'; }} | Correct. | PHP |
val c = 'hello' | val c = "hello" | Double quotes. | Kotlin |
let result = 47; result += 1; | let mut result = 47; result += 1; | Need mut to modify. | Rust |
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 |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
if (val = 53) {{}} | if (val == 53) {{}} | Use ==. | Java |
// comment | /* comment */ | Use /* */. | CSS |
if c = 79 | if c == 79 | Use ==. | MATLAB |
if (a = 1) | if (a == 1) | Use ==. | Scala |
.User {{ color: red; }} | .User {{ color: red; }} | Correct. | CSS |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
{{"value":"info" "age":35}} | {{"value":"info", "age":35}} | Add comma. | JSON |
if ($bar = 80) {{}} | if ($bar -eq 80) {{}} | Use -eq. | PowerShell |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
<entry name='hello'/> | <entry name="hello"/> | Double quotes. | XML |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
DELETE FROM users WHERE status=8 | DELETE FROM users WHERE status=8; | Add semicolon. | SQL |
<input type='text' value='value'> | <input type='text' value='value' name='name'> | Add name attribute. | HTML |
assert z > 30 | assert z > 30 | Correct. | Python |
$num = 74; if ($num = 74) {{}} | $num = 74; if ($num == 74) {{}} | Use ==. | PHP |
sys.sqrt(79) | import sys
sys.sqrt(79) | Import module first. | Python |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
if c = 64 | if c == 64 | Use ==. | Go |
name: output
age: 67 | name: output
age: 67 | Correct. | YAML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if y = 46 | if y == 46 | Use ==. | Ruby |
[84, 33, 11 | [84, 33, 11] | Close bracket. | Python |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
let val: number = 'info'; | let val: string = 'info'; | Fix type. | TypeScript |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
'85' + 39 | 85 + 39 | Avoid string coercion. | JavaScript |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
jwt.sign({{id:46}}, 'token'); | jwt.sign({{id:46}}, 'token', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for i=1,67 do print(i) end | for i=1,67 do print(i) end | Correct. | Lua |
<person age=78> | <person age="78"> | Quote attribute. | XML |
if (index = 75) {} | if (index == 75) {} | Use ==. | Dart |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
status: result
name: test, | status: result
name: test | Remove comma. | YAML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
list[80] | if list.indices.contains(80) {{ list[80] }} | Check index. | Swift |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if val > 53
puts 'hello' | if val > 53
puts 'hello'
end | Add 'end'. | Ruby |
if b = 99: | if b == 99: | Use == for comparison. | Python |
const result = 3; result = 20; | let result = 3; result = 20; | Cannot reassign const. | JavaScript |
def baz(count):
return count + 1 | def baz(count):
return count + 1 | Correct. | Python |
function bar() {{
return
{{key:'test'}}
}} | function bar() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
arr[62] | if (arr.indices.contains(62)) arr[62] | Check index. | Kotlin |
if y = 36 then
print('data')
end | if y == 36 then
print('data')
end | Use ==. | Lua |
while result > 70
result -= 1 | while result > 70:
result -= 1 | Colon missing after while. | Python |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
let mut num=99; let r1=&mut num; let ref2=&mut num; | let mut num=99; {{ let r1=&mut num; }} let ref2=&mut num; | Only one mutable borrow. | Rust |
println('world') | println("world") | Double quotes. | Scala |
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