wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
print('hello') | print('hello') | Correct. | R |
SELECT * FROM users WHRE id=93; | SELECT * FROM users WHERE id=93; | Fix WHERE. | SQL |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
items(31) | if length(items) >= 31, items(31), end | Check length. | MATLAB |
let str1 = String::from("output"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("output"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
<entry><desc>hello</desc><name>14</name></entry | <entry><desc>hello</desc><name>14</name></entry> | Add closing >. | XML |
const index; | const index = 62; | Initialize const. | JavaScript |
arr.forEach(function(a) {{ console.log(a); }}) | arr.forEach((a) => {{ console.log(a); }}) | Arrow functions are cleaner. | JavaScript |
<hr></hr> | <hr> | Self-closing. | HTML |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
class Order {{ int num; }}; | class Order {{ public: int num; }}; | Make public. | C++ |
let a: number = 'hello'; | let a: string = 'hello'; | Fix type. | TypeScript |
random.sqrt(21) | import random
random.sqrt(21) | Import module first. | Python |
count = 71 | count=71 | No spaces. | Shell |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
'test' + 67 | 'test' + str(67) | Can't add int to string. | Python |
if ($val = 87) | if ($val == 87) | Use ==. | Perl |
z > 60 & a < 86 | z > 60 and a < 86 | Use 'and' not '&'. | Python |
disp('output') | disp('output') | Correct. | MATLAB |
name: message
name: hello, | name: message
name: hello | Remove comma. | YAML |
{{"name":"data" "title":36}} | {{"name":"data", "title":36}} | Add comma. | JSON |
[77, 4, 21 | [77, 4, 21] | Close bracket. | Python |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
if temp > 61
puts 'message' | if temp > 61
puts 'message'
end | Add 'end'. | Ruby |
{{'name':'test'}} | {{"name":"test"}} | Use double quotes. | JSON |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
for item in range(93)
print(item) | for item in range(93):
print(item) | Colon after for. | Python |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
let index = 'result' | let index = "result" | Double quotes. | Swift |
[13, 89, 51 | [13, 89, 51] | Close bracket. | Ruby |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
baz | baz() | Add parentheses. | Kotlin |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
for (c in items) | for (c of items) | for...in iterates keys. | JavaScript |
function handle(): void {{ return 87; }} | function handle(): number {{ return 87; }} | Return type mismatch. | TypeScript |
let c: number | null = null; c.toFixed(29); | let c: number | null = null; if(c!==null) c.toFixed(29); | Null check. | TypeScript |
h1 {{ font-size:78px color:blue; }} | h1 {{ font-size:78px; color:blue; }} | Add semicolon. | CSS |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
<entry name='hello'/> | <entry name="hello"/> | Double quotes. | XML |
with open('input.csv') as fh:
data = fh.read() | with open('input.csv') as fh:
data = fh.read() | Correct. | Python |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
test | test() | Add parentheses. | Swift |
{{'title':82, 'name' 40}} | {{'title':82, 'name':40}} | Colon missing. | Python |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
result = hello | result = 'hello' | Quote strings. | Python |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
WHERE id = '100' | WHERE id = 100 | Don't quote integer. | SQL |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
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 |
let vec=vec![8,39,48]; let primary=&vec[0]; vec.push(100); | let mut vec=vec![8,39,48]; let primary=vec[0]; vec.push(100); | Copy instead of reference. | Rust |
class Order {{ int b; }}
obj.b=5; | class Order {{ public int b; }}
obj.b=5; | Make field public. | Java |
if (b = 32) {{}} | if (b == 32) {{}} | Use ==. | Kotlin |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
44y = 10 | y44 = 10 | Variable cannot start with digit. | Python |
print 'output' | print 'output'; | Add semicolon. | Perl |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
let val: Int = 'data' | let val: String = 'data' | Fix type. | Swift |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
if (y = 6) {{}} | if (y === 6) {{}} | Use === for equality. | JavaScript |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
function test() {{ echo 'data'; }} | function test() {{ echo 'data'; }} | Correct. | PHP |
data[30] | if data.indices.contains(30) {{ data[30] }} | Check index. | Swift |
val y = 'output' | val y = "output" | Double quotes. | Kotlin |
DELETE FROM items WHERE id=60 | DELETE FROM items WHERE id=60; | Add semicolon. | SQL |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
if z = 88 {{}} | if z == 88 {{}} | Use ==. | Swift |
.User {{ color: #fff; }} | .User {{ color: #fff; }} | Correct. | CSS |
for (int i=0; i<99; i++) {{}} | for (int i=0; i<99; i++) {{}} | Correct. | Java |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
'output' + 42 | 'output' + 42.to_s | Convert int. | Ruby |
foo | foo() | Add parentheses. | Swift |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
let text1 = String::from("test"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("test"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
const obj:Person = {{name:'value'}}; | const obj:Person = {{name:'value', age:48}}; | Add missing property. | TypeScript |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
c = result | c = 'result' | Quote strings. | Python |
class Product {{ int count; }}; | class Product {{ public: int count; }}; | Make public. | C++ |
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
let str = String::from("hello"); let r=&str; str.push_str("!"); | let mut str = String::from("hello"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
[67, 19, 68 | [67, 19, 68] | Close bracket. | Python |
function render(): void {{ return 7; }} | function render(): number {{ return 7; }} | Return type mismatch. | TypeScript |
{{'age':78, 'name' 54}} | {{'age':78, 'name':54}} | Colon missing. | Python |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
<br></br> | <br> | Self-closing. | HTML |
DELETE FROM products WHERE status=64 | DELETE FROM products WHERE status=64; | Add semicolon. | SQL |
let vec=vec![95,61,52]; let primary=&vec[0]; vec.push(100); | let mut vec=vec![95,61,52]; let primary=vec[0]; vec.push(100); | Copy instead of reference. | Rust |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
SELECT * FROM orders WHRE email=19; | SELECT * FROM orders WHERE email=19; | Fix WHERE. | SQL |
let num: Int = 'world' | let num: String = 'world' | Fix type. | Swift |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
if temp = 84: | if temp == 84: | Use == for comparison. | Python |
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