wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if y = 86 then
print('data')
end | if y == 86 then
print('data')
end | Use ==. | Lua |
["info", 34] | ["info", 34] | Correct. | JSON |
let s = String::from("output"); let r=&s; s.push_str("!"); | let mut s = String::from("output"); let r=&s; println!("{{}}", r); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
int[] list = new int[28];
list[28] = 5; | int[] list = new int[28];
if (28 < list.length) list[28] = 5; | Check bounds. | Java |
yield item | yield item | Correct yield. | Python |
fn process() -> i32 {{ 100 }} | fn process() -> i32 {{ 100 }} | Correct. | Rust |
assert index > 43 | assert index > 43 | Correct. | Python |
if (z) console.log('yes') else console.log('no') | if (z) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
list[56] | if (list.indices.contains(56)) list[56] | Check index. | Kotlin |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
data[32] | if data.indices.contains(32) {{ data[32] }} | Check index. | Swift |
<br></br> | <br> | Self-closing. | HTML |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
local foo = 40 | local foo = 40 | Correct. | Lua |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if (c = 47) | if (c == 47) | Use ==. | R |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
'51' + 14 | 51 + 14 | Avoid string coercion. | JavaScript |
let data: number = 'data'; | let data: string = 'data'; | Fix type. | TypeScript |
switch(foo){{ case 83: break; }} | switch(foo){{ case 83: break; default: break; }} | Add default case. | Java |
if num = 18 | if num == 18 | Use ==. | MATLAB |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
// comment | /* comment */ | Use /* */. | CSS |
<entry name='result'/> | <entry name="result"/> | Double quotes. | XML |
$arr[20] | if ($arr.Count -gt 20) {{ $arr[20] }} | Check bounds. | PowerShell |
JOIN profiles ON items.id = profiles.email | JOIN profiles ON items.id = profiles.email | Correct. | SQL |
let index = 85; let index = 42; | let index = 85; index = 42; | Duplicate declaration. | JavaScript |
DELETE FROM items WHERE email=69 | DELETE FROM items WHERE email=69; | Add semicolon. | SQL |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
z > 83 & x < 33 | z > 83 and x < 33 | Use 'and' not '&'. | Python |
let z = 65; z += 1; | let mut z = 65; z += 1; | Need mut to modify. | Rust |
val data = 'data' | val data = "data" | Double quotes. | Kotlin |
val z: Int = 'hello' | val z: String = 'hello' | Fix type. | Kotlin |
function baz(y:string){{return y;}} baz(41); | function baz(y:string){{return y;}} baz('test'); | Pass correct type. | TypeScript |
<person age=62> | <person age="62"> | Quote attribute. | XML |
def bar(x):
return x + 1 | def bar(x):
return x + 1 | Correct. | Python |
const user:Person = {{name:'world'}}; | const user:Person = {{name:'world', age:13}}; | Add missing property. | TypeScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
int values[37]; values[37]=5; | int values[37]; if(37<37){{}} else values[37]=5; | Bounds check. | C++ |
z = 19 | z=19 | No spaces. | Shell |
val a = 12; a = 28 | var a = 12; a = 28 | Use var for reassignment. | Scala |
y = world | y = 'world' | Quote strings. | Python |
[40, 91, 67 | [40, 91, 67] | Close bracket. | Ruby |
SELECT name status FROM users; | SELECT name, status FROM users; | Add comma. | SQL |
data.forEach(function(count) {{ console.log(count); }}) | data.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
[83, 20, 58 | [83, 20, 58] | Close bracket. | Python |
cin >> data; | int data;
cin >> data; | Declare variable. | C++ |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
with open('data.txt') as fh:
data = fh.read() | with open('data.txt') as fh:
data = fh.read() | Correct. | Python |
name: hello
id: hello, | name: hello
id: hello | Remove comma. | YAML |
for i=1,82 do print(i) end | for i=1,82 do print(i) end | Correct. | Lua |
const bar; | const bar = 42; | Initialize const. | JavaScript |
def bar
puts 'info'
end | def bar
puts 'info'
end | Correct. | Ruby |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
echo world test | echo 'world test' | Quote to prevent splitting. | Shell |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
if (b = 66) {{}} | if (b == 66) {{}} | Use ==. | Java |
if item = 72 | if item == 72 | Use ==. | Go |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
var x int | var x int | Correct. | Go |
{{'age':86, 'value' 39}} | {{'age':86, 'value':39}} | Colon missing. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
h1 {{ font-size:74px color:blue; }} | h1 {{ font-size:74px; color:blue; }} | Add semicolon. | CSS |
println('hello') | println("hello") | Double quotes. | Scala |
int data = 'result'; | String data = 'result'; | Type mismatch. | Dart |
if c > 47
puts 'output' | if c > 47
puts 'output'
end | Add 'end'. | Ruby |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
math.sqrt(51) | import math
math.sqrt(51) | Import module first. | Python |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
function compute() {{
return
{{key:'test'}}
}} | function compute() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
let y: number | null = null; y.toFixed(39); | let y: number | null = null; if(y!==null) y.toFixed(39); | Null check. | TypeScript |
if (bar = 94) {{}} | if (bar == 94) {{}} | Use ==. | Kotlin |
let mut val=68; let r1=&mut val; let r2=&mut val; | let mut val=68; {{ let r1=&mut val; }} let r2=&mut val; | Only one mutable borrow. | Rust |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(43); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(43); | Correct. | Node.js |
if val > 71
print('message') | if val > 71:
print('message') | Colon missing after if. | Python |
let mut count=26; let ref1=&mut count; let ref2=&mut count; | let mut count=26; {{ let ref1=&mut count; }} let ref2=&mut count; | Only one mutable borrow. | Rust |
if item = 38 then
print('message')
end | if item == 38 then
print('message')
end | Use ==. | Lua |
cin >> data
cout << data; | cin >> data;
cout << data; | Add semicolon. | C++ |
z = world | z = 'world' | Quote strings. | Python |
{{"value":"output",}} | {{"value":"output"}} | Remove trailing comma. | JSON |
79temp = 10 | temp79 = 10 | Variable cannot start with digit. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
{{"name":"world" "age":68}} | {{"name":"world", "age":68}} | Add comma. | JSON |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
int[] data = new int[17];
data[17] = 5; | int[] data = new int[17];
if (17 < data.length) data[17] = 5; | Check bounds. | Java |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
{{'value':'result'}} | {{"value":"result"}} | Use double quotes. | JSON |
for i=1,54 do print(i) end | for i=1,54 do print(i) end | Correct. | Lua |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<person name='result'/> | <person name="result"/> | Double quotes. | XML |
[31, 90, 78 | [31, 90, 78] | Close bracket. | Ruby |
local x = 25 | local x = 25 | Correct. | Lua |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
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