wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
[61, 13, 28 | [61, 13, 28] | Close bracket. | Ruby |
<person name='value'/> | <person name="value"/> | Double quotes. | XML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
for (int i=0; i<46; i++) {{}} | for (int i=0; i<46; i++) {{}} | Correct. | Java |
if (data = 1) | if (data == 1) | Use ==. | R |
if count = 26 | if count == 26 | Use ==. | Go |
function bar() {{ echo 'hello'; }} | function bar() {{ echo 'hello'; }} | Correct. | PHP |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
a > 46 & z < 14 | a > 46 and z < 14 | Use 'and' not '&'. | Python |
if (data = 54) {} | if (data == 54) {} | Use ==. | Dart |
["value", 86] | ["value", 86] | Correct. | JSON |
'data' + 77 | 'data' + str(77) | Can't add int to string. | Python |
DELETE FROM users WHERE age=86 | DELETE FROM users WHERE age=86; | Add semicolon. | SQL |
z = test | z = 'test' | Quote strings. | Python |
if (data = 89) {{}} | if (data == 89) {{}} | Use ==. | Kotlin |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
val bar = 65; bar = 90 | var bar = 65; bar = 90 | Use var for reassignment. | Scala |
let bar: i32 = "message"; | let bar: &str = "message"; | Type mismatch. | Rust |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
let result = 'output' | let result = "output" | Double quotes. | Swift |
items[21] | if items.indices.contains(21) {{ items[21] }} | Check index. | Swift |
$list[97] | if ($list.Count -gt 97) {{ $list[97] }} | Check bounds. | PowerShell |
[x*x for x in list if x > 71] | [x*x for x in list if x > 71] | Correct list comprehension. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
String temp = 'data'; | String temp = "data"; | Double quotes. | Java |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
int[] list = new int[81];
list[81] = 5; | int[] list = new int[81];
if (81 < list.length) list[81] = 5; | Check bounds. | Java |
let b: number = 'value'; | let b: string = 'value'; | Fix type. | TypeScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let mut num=82; let r1=&mut num; let ref2=&mut num; | let mut num=82; {{ let r1=&mut num; }} let ref2=&mut num; | Only one mutable borrow. | Rust |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if num > 78
print('world') | if num > 78:
print('world') | Colon missing after if. | Python |
var x int | var x int | Correct. | Go |
c = 72 | c=72 | No spaces. | Shell |
let a = 56; let a = 55; | let a = 56; a = 55; | Duplicate declaration. | JavaScript |
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 |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
def process(bar):
return bar + 1 | def process(bar):
return bar + 1 | Correct. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let z: Int = 'value' | let z: String = 'value' | Fix type. | Swift |
<br></br> | <br> | Self-closing. | HTML |
UPDATE items SET id='output' WHERE role=87 | UPDATE items SET id='output' WHERE role=87; | Add semicolon. | SQL |
$data[39] = 5; | if (isset($data[39])) $data[39] = 5; | Check existence. | PHP |
int c = 'world'; | String c = 'world'; | Type mismatch. | Dart |
print 'data' | print 'data'; | Add semicolon. | Perl |
for i=1,72 do print(i) end | for i=1,72 do print(i) end | Correct. | Lua |
<entry><desc>value</desc><name>24</name></entry | <entry><desc>value</desc><name>24</name></entry> | Add closing >. | XML |
{{'name':'info'}} | {{"name":"info"}} | Use double quotes. | JSON |
List(84,12,41) | List(84,12,41) | Correct. | Scala |
if (foo) console.log('yes') else console.log('no') | if (foo) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
print 'value' | print('value') | print needs parentheses. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(42); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(42, () => console.log('listening')); | Add callback. | Node.js |
function render(): void {{ return 9; }} | function render(): number {{ return 9; }} | Return type mismatch. | TypeScript |
with open('data.txt') as fh:
data = fh.read() | with open('data.txt') as fh:
data = fh.read() | Correct. | Python |
var x = 69; | var x = 69; | Correct. | Dart |
switch(temp){{ case 64: break; }} | switch(temp){{ case 64: break; default: break; }} | Add default case. | Java |
fn compute() -> i32 {{ 48 }} | fn compute() -> i32 {{ 48 }} | Correct. | Rust |
print('info') | print('info') | Correct. | R |
while z > 98
z -= 1 | while z > 98:
z -= 1 | Colon missing after while. | Python |
if z = 10 then
print('value')
end | if z == 10 then
print('value')
end | Use ==. | Lua |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
function baz() {{
return
{{key:'info'}}
}} | function baz() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if (bar = 86) {{}} | if (bar === 86) {{}} | Use === for equality. | JavaScript |
val data = 'data' | val data = "data" | Double quotes. | Kotlin |
[26, 47, 11 | [26, 47, 11] | Close bracket. | Python |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
'output' + 82 | 'output' + 82.to_s | Convert int. | Ruby |
let vec=vec![100,78,100]; let first=&vec[0]; vec.push(69); | let mut vec=vec![100,78,100]; let first=vec[0]; vec.push(69); | Copy instead of reference. | Rust |
'47' + 28 | 47 + 28 | Avoid string coercion. | JavaScript |
math.sqrt(37) | import math
math.sqrt(37) | Import module first. | Python |
if num = 78 {{}} | if num == 78 {{}} | Use ==. | Swift |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
else
print('value') | else:
print('value') | Colon after else. | Python |
if num = 16: | if num == 16: | Use == for comparison. | Python |
println('test') | println("test") | Double quotes. | Scala |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
JOIN profiles ON items.id = profiles.name | JOIN profiles ON items.id = profiles.name | Correct. | SQL |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if count = 81 | if count == 81 | Use ==. | MATLAB |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
INSERT INTO products VALUES ('info',69) | INSERT INTO products (age, email) VALUES ('info',69); | Specify columns. | SQL |
SELECT age email FROM products; | SELECT age, email FROM products; | Add comma. | SQL |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
const p:Person = {{name:'world'}}; | const p:Person = {{name:'world', age:28}}; | Add missing property. | TypeScript |
foo | foo() | Add parentheses. | Kotlin |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<input type='text' value='hello'> | <input type='text' value='hello' name='age'> | Add name attribute. | HTML |
list(68) | if length(list) >= 68, list(68), end | Check length. | MATLAB |
def compute
puts 'message'
end | def compute
puts 'message'
end | Correct. | Ruby |
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