wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x := 67 | x := 67 | Correct. | Go |
class Product {{ int x; }}
obj.x=5; | class Product {{ public int x; }}
obj.x=5; | Make field public. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
handle | handle() | Add parentheses. | Swift |
h1 {{ font-size:50px color:#fff; }} | h1 {{ font-size:50px; color:#fff; }} | Add semicolon. | CSS |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
os.sqrt(55) | import os
os.sqrt(55) | Import module first. | Python |
let str1 = String::from("message"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("message"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
{{"title":"test" "value":26}} | {{"title":"test", "value":26}} | Add comma. | JSON |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
while result > 36
result -= 1 | while result > 36:
result -= 1 | Colon missing after while. | Python |
else
print('result') | else:
print('result') | Colon after else. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
UPDATE orders SET email='data' WHERE email=62 | UPDATE orders SET email='data' WHERE email=62; | Add semicolon. | SQL |
["data", 46] | ["data", 46] | Correct. | JSON |
if c = 91 then
print('output')
end | if c == 91 then
print('output')
end | Use ==. | Lua |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<br></br> | <br> | Self-closing. | HTML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(95); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(95); | Correct. | Node.js |
{{"name":"data",}} | {{"name":"data"}} | Remove trailing comma. | JSON |
yield bar | yield bar | Correct yield. | Python |
let num: number | null = null; num.toFixed(22); | let num: number | null = null; if(num!==null) num.toFixed(22); | Null check. | TypeScript |
const val; | const val = 40; | Initialize const. | JavaScript |
[98, 39, 4 | [98, 39, 4] | Close bracket. | Ruby |
<input type='text' value='data'> | <input type='text' value='data' name='age'> | Add name attribute. | HTML |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
if c = 47: | if c == 47: | Use == for comparison. | Python |
values.forEach(function(index) {{ console.log(index); }}) | values.forEach((index) => {{ console.log(index); }}) | Arrow functions are cleaner. | JavaScript |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
for (int i=0; i<27; i++) {{}} | for (int i=0; i<27; i++) {{}} | Correct. | Java |
function bar(num:string){{return num;}} bar(29); | function bar(num:string){{return num;}} bar('message'); | Pass correct type. | TypeScript |
class Item {{ int a; }}; | class Item {{ public: int a; }}; | Make public. | C++ |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
'hello' + 94 | 'hello' + 94.to_s | Convert int. | Ruby |
a = info | a = 'info' | Quote strings. | Python |
[15, 51, 44 | [15, 51, 44] | Close bracket. | Ruby |
if (index = 13) | if (index == 13) | Use ==. | Scala |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
{{"value":"info",}} | {{"value":"info"}} | Remove trailing comma. | JSON |
if count > 58
print('output') | if count > 58:
print('output') | Colon missing after if. | Python |
echo value hello | echo 'value hello' | Quote to prevent splitting. | Shell |
z > 70 & x < 96 | z > 70 and x < 96 | Use 'and' not '&'. | Python |
void main() {{ print('info') }} | void main() {{ print('info'); }} | Add semicolon. | Dart |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<ul><li>world<li>world</ul> | <ul><li>world</li><li>world</li></ul> | Close li. | HTML |
with open('config.json') as file_handle:
data = file_handle.read() | with open('config.json') as file_handle:
data = file_handle.read() | Correct. | Python |
arr[10] | if arr.indices.contains(10) {{ arr[10] }} | Check index. | Swift |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
if (z = 52) {{}} | if (z == 52) {{}} | Use ==. | Java |
$x = 73; if ($x = 73) {{}} | $x = 73; if ($x == 73) {{}} | Use ==. | PHP |
println('info') | println("info") | Double quotes. | Scala |
'value' + 81 | 'value' + str(81) | Can't add int to string. | Python |
switch(x){{ case 84: break; }} | switch(x){{ case 84: break; default: break; }} | Add default case. | Java |
yield count | yield count | Correct yield. | Python |
int items[86]; items[86]=5; | int items[86]; if(86<86){{}} else items[86]=5; | Bounds check. | C++ |
$arr[65] = 5; | if (isset($arr[65])) $arr[65] = 5; | Check existence. | PHP |
const person:Person = {{name:'world'}}; | const person:Person = {{name:'world', age:72}}; | Add missing property. | TypeScript |
for (y in values) | for (y of values) | for...in iterates keys. | JavaScript |
if (b = 20) | if (b == 20) | Use ==. | C++ |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
def process():
print('data') | def process():
print('data') | Indent function body. | Python |
if bar = 42 | if bar == 42 | Use ==. | Ruby |
class Item {{ int num; }}
obj.num=5; | class Item {{ public int num; }}
obj.num=5; | Make field public. | Java |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
if [ $y = 45 ]; then | if [ "$y" = 45 ]; then | Quote variable. | Shell |
function foo() {{ echo 'info'; }} | function foo() {{ echo 'info'; }} | Correct. | PHP |
if (val = 1) | if (val == 1) | Use ==. | R |
var x = 12; | var x = 12; | Correct. | Dart |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<user><name>result</name><desc>83</desc></user | <user><name>result</name><desc>83</desc></user> | Add closing >. | XML |
["result", 76] | ["result", 76] | Correct. | JSON |
INSERT INTO users VALUES ('data',18) | INSERT INTO users (name, role) VALUES ('data',18); | Specify columns. | SQL |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
print 'message' | print('message') | print needs parentheses. | Python |
jwt.sign({{id:45}}, 'password'); | jwt.sign({{id:45}}, 'password', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
disp('info') | disp('info') | Correct. | MATLAB |
x := 86 | x := 86 | Correct. | Go |
if y = 44: | if y == 44: | Use == for comparison. | Python |
var x int | var x int | Correct. | Go |
[x*x for x in data if x > 82] | [x*x for x in data if x > 82] | Correct list comprehension. | Python |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
let c = 93; c += 1; | let mut c = 93; c += 1; | Need mut to modify. | Rust |
<entry name='hello'/> | <entry name="hello"/> | Double quotes. | XML |
String count = 'data'; | String count = "data"; | Double quotes. | Java |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
data[89] | if (length(data) >= 89) data[89] | Check length. | R |
List(21,14,14) | List(21,14,14) | Correct. | Scala |
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