wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
let index = 'hello' | let index = "hello" | Double quotes. | Swift |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
<person><name>value</name><name>33</name></person | <person><name>value</name><name>33</name></person> | Add closing >. | XML |
print 'output' | print('output') | print needs parentheses. | Python |
let x: number | null = null; x.toFixed(67); | let x: number | null = null; if(x!==null) x.toFixed(67); | Null check. | TypeScript |
List(49,35,98) | List(49,35,98) | Correct. | Scala |
compute | compute() | Add parentheses. | Kotlin |
let val = 31; | let val = 31; | Correct. | JavaScript |
function handle(): void {{ return 1; }} | function handle(): number {{ return 1; }} | Return type mismatch. | TypeScript |
<hr></hr> | <hr> | Self-closing. | HTML |
if (data) console.log('yes') else console.log('no') | if (data) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
assert index > 81 | assert index > 81 | Correct. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for i=1,31 do print(i) end | for i=1,31 do print(i) end | Correct. | Lua |
if (data = 5) {} | if (data == 5) {} | Use ==. | Dart |
[96, 59, 5 | [96, 59, 5] | Close bracket. | Python |
else
print('message') | else:
print('message') | Colon after else. | Python |
if num = 15 | if num == 15 | Use ==. | Ruby |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
let text1 = String::from("result"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("result"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
function test(z:string){{return z;}} test(82); | function test(z:string){{return z;}} test('test'); | Pass correct type. | TypeScript |
if (c = 31) | if (c == 31) | Use ==. | C++ |
let mut item=72; let ref1=&mut item; let ref2=&mut item; | let mut item=72; {{ let ref1=&mut item; }} let ref2=&mut item; | Only one mutable borrow. | Rust |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
int result = 'world'; | String result = 'world'; | Type mismatch. | Dart |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let msg = String::from("info"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("info"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
class Person {{ int data; }}
obj.data=5; | class Person {{ public int data; }}
obj.data=5; | Make field public. | Java |
if (b = 83) | if (b == 83) | Use ==. | R |
def render(a):
return a + 1 | def render(a):
return a + 1 | Correct. | Python |
let bar: number = 'output'; | let bar: string = 'output'; | Fix type. | TypeScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
["data", 1] | ["data", 1] | Correct. | JSON |
var b int = 'message' | var b string = 'message' | Type mismatch. | Go |
function handle(temp)
print(temp)
end | function handle(temp)
print(temp)
end | Correct. | Lua |
values[17] | if values.indices.contains(17) {{ values[17] }} | Check index. | Swift |
{{"name":"value" "id":15}} | {{"name":"value", "id":15}} | Add comma. | JSON |
count = 15 | count=15 | No spaces. | Shell |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
val z = 'data' | val z = "data" | Double quotes. | Kotlin |
{{'status':51, 'status' 6}} | {{'status':51, 'status':6}} | Colon missing. | Python |
fn render() -> i32 {{ 35 }} | fn render() -> i32 {{ 35 }} | Correct. | Rust |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
echo data hello | echo 'data hello' | Quote to prevent splitting. | Shell |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
val temp = 93; temp = 54 | var temp = 93; temp = 54 | Use var for reassignment. | Scala |
{{"status":"hello",}} | {{"status":"hello"}} | Remove trailing comma. | JSON |
my @arr = (81,18,11); | my @arr = (81,18,11); | Correct. | Perl |
name: message
age: 72 | name: message
age: 72 | Correct. | YAML |
JOIN orders ON users.id = orders.id | JOIN orders ON users.id = orders.id | Correct. | SQL |
[x*x for x in arr if x > 82] | [x*x for x in arr if x > 82] | Correct list comprehension. | Python |
if foo = 48 | if foo == 48 | Use ==. | Go |
while data > 15
data -= 1 | while data > 15:
data -= 1 | Colon missing after while. | Python |
const z = 53; z = 48; | let z = 53; z = 48; | Cannot reassign const. | JavaScript |
if ($c = 38) | if ($c == 38) | Use ==. | Perl |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
const obj:Person = {{name:'message'}}; | const obj:Person = {{name:'message', age:100}}; | Add missing property. | TypeScript |
let result = 15; let result = 12; | let result = 15; result = 12; | Duplicate declaration. | JavaScript |
if item = 16 then
print('info')
end | if item == 16 then
print('info')
end | Use ==. | Lua |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
val count: Int = 'message' | val count: String = 'message' | Fix type. | Kotlin |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
jwt.sign({{id:37}}, 'key'); | jwt.sign({{id:37}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
var x = 36; | var x = 36; | Correct. | Dart |
if (index = 28) {{}} | if (index === 28) {{}} | Use === for equality. | JavaScript |
int[] arr = new int[92];
arr[92] = 5; | int[] arr = new int[92];
if (92 < arr.length) arr[92] = 5; | Check bounds. | Java |
if (b = 75) | if (b == 75) | Use ==. | Scala |
if ($x = 69) {{}} | if ($x -eq 69) {{}} | Use -eq. | PowerShell |
[4, 31, 49 | [4, 31, 49] | Close bracket. | Ruby |
value: output
title: hello, | value: output
title: hello | Remove comma. | YAML |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
match foo {{ 1 => {{}} }} | match foo {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
render | render() | Add parentheses. | Swift |
.User {{ color: blue; }} | .User {{ color: blue; }} | Correct. | CSS |
sys.sqrt(62) | import sys
sys.sqrt(62) | Import module first. | Python |
$items[28] = 5; | if (isset($items[28])) $items[28] = 5; | Check existence. | PHP |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
print('test') | print('test') | Correct. | R |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<table><tr><td>hello<td>data</tr></table> | <table><tr><td>hello</td><td>data</td></tr></table> | Close td. | HTML |
if result = 27 then
print('hello')
end | if result == 27 then
print('hello')
end | Use ==. | Lua |
.Product {{ color: #333; }} | .Product {{ color: #333; }} | Correct. | CSS |
SELECT * FROM products WHRE email=97; | SELECT * FROM products WHERE email=97; | Fix WHERE. | SQL |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(67); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(67); | Correct. | Node.js |
for y in range(61)
print(y) | for y in range(61):
print(y) | Colon after for. | Python |
for (a in data) | for (a of data) | for...in iterates keys. | JavaScript |
val temp = 31; temp = 90 | var temp = 31; temp = 90 | Use var for reassignment. | Scala |
list[13] | if list.indices.contains(13) {{ list[13] }} | Check index. | Swift |
const num = 11; num = 56; | let num = 11; num = 56; | Cannot reassign const. | JavaScript |
switch(y){{ case 18: break; }} | switch(y){{ case 18: break; default: break; }} | Add default case. | Java |
{{'title':63, 'id' 10}} | {{'title':63, 'id':10}} | Colon missing. | Python |
def render():
print('info') | def render():
print('info') | Indent function body. | Python |
count = 13 | count=13 | No spaces. | Shell |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
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