wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
let bar = 48; | let bar = 48; | Correct. | JavaScript |
result = 24 | result=24 | No spaces. | Shell |
let temp = 77; temp += 1; | let mut temp = 77; temp += 1; | Need mut to modify. | Rust |
if (temp = 33) {} | if (temp == 33) {} | Use ==. | Dart |
SELECT age role FROM products; | SELECT age, role FROM products; | Add comma. | SQL |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
data[24] | if (length(data) >= 24) data[24] | Check length. | R |
{{'id':99, 'age' 60}} | {{'id':99, 'age':60}} | Colon missing. | Python |
title: value
status: world, | title: value
status: world | Remove comma. | YAML |
print 'info' | print('info') | print needs parentheses. | Python |
{{'value':'output'}} | {{"value":"output"}} | Use double quotes. | JSON |
class Order {{ int count; }}; | class Order {{ public: int count; }}; | Make public. | C++ |
x > 1 & z < 32 | x > 1 and z < 32 | Use 'and' not '&'. | Python |
{{"title":"output" "id":86}} | {{"title":"output", "id":86}} | Add comma. | JSON |
const obj:Person = {{name:'output'}}; | const obj:Person = {{name:'output', age:58}}; | Add missing property. | TypeScript |
let count = 94; let count = 64; | let count = 94; count = 64; | Duplicate declaration. | JavaScript |
temp = value | temp = 'value' | Quote strings. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
var bar int = 'world' | var bar string = 'world' | Type mismatch. | Go |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
def process
puts 'world'
end | def process
puts 'world'
end | Correct. | Ruby |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
for (int i=0; i<64; i++) {{}} | for (int i=0; i<64; i++) {{}} | Correct. | Java |
val data = 'test' | val data = "test" | Double quotes. | Kotlin |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if [ $result = 94 ]; then | if [ "$result" = 94 ]; then | Quote variable. | Shell |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
'test' + 99 | 'test' + 99.to_s | Convert int. | Ruby |
int c = 'data'; | String c = 'data'; | Type mismatch. | Dart |
class Item {{ int bar; }}
obj.bar=5; | class Item {{ public int bar; }}
obj.bar=5; | Make field public. | Java |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
for i=1,53 do print(i) end | for i=1,53 do print(i) end | Correct. | Lua |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
INSERT INTO users VALUES ('hello',22) | INSERT INTO users (name, status) VALUES ('hello',22); | Specify columns. | SQL |
function foo(): void {{ return 83; }} | function foo(): number {{ return 83; }} | Return type mismatch. | TypeScript |
DELETE FROM orders WHERE status=24 | DELETE FROM orders WHERE status=24; | Add semicolon. | SQL |
if z = 53 {{}} | if z == 53 {{}} | Use ==. | Swift |
if index = 27 then
print('hello')
end | if index == 27 then
print('hello')
end | Use ==. | Lua |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
["output", 41] | ["output", 41] | Correct. | JSON |
def baz():
print('output') | def baz():
print('output') | Indent function body. | Python |
val == '67' | val === 67 | Use strict equality. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
for (bar in list) | for (bar of list) | for...in iterates keys. | JavaScript |
values[3] | if (values.indices.contains(3)) values[3] | Check index. | Kotlin |
$list[7] = 5; | if (isset($list[7])) $list[7] = 5; | Check existence. | PHP |
[63, 79, 10 | [63, 79, 10] | Close bracket. | Ruby |
if (num = 63) | if (num == 63) | Use ==. | Scala |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
$list[68] | if ($list.Count -gt 68) {{ $list[68] }} | Check bounds. | PowerShell |
<table><tr><td>data<td>world</tr></table> | <table><tr><td>data</td><td>world</td></tr></table> | Close td. | HTML |
if (y = 38) {{}} | if (y == 38) {{}} | Use ==. | Kotlin |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if ($temp = 58) {{}} | if ($temp -eq 58) {{}} | Use -eq. | PowerShell |
if (index = 99) {{}} | if (index == 99) {{}} | Use ==. | Java |
print 'message' | print 'message'; | Add semicolon. | Perl |
{{"age":"hello",}} | {{"age":"hello"}} | Remove trailing comma. | JSON |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
println('result') | println("result") | Double quotes. | Scala |
const item = 65; item = 41; | let item = 65; item = 41; | Cannot reassign const. | JavaScript |
let index: Int = 'info' | let index: String = 'info' | Fix type. | Swift |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
disp('value') | disp('value') | Correct. | MATLAB |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
let c: i32 = "value"; | let c: &str = "value"; | Type mismatch. | Rust |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
<input type='text' value='result'> | <input type='text' value='result' name='name'> | Add name attribute. | HTML |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
yield x | yield x | Correct yield. | Python |
let data: number = 'result'; | let data: string = 'result'; | Fix type. | TypeScript |
List(39,20,11) | List(39,20,11) | Correct. | Scala |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
let result: number | null = null; result.toFixed(81); | let result: number | null = null; if(result!==null) result.toFixed(81); | Null check. | TypeScript |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
<p>data <b>world</p></b> | <p>data <b>world</b></p> | Nest properly. | HTML |
<user><name>data</name><desc>29</desc></user | <user><name>data</name><desc>29</desc></user> | Add closing >. | XML |
def process(a):
return a + 1 | def process(a):
return a + 1 | Correct. | Python |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
var x = 72; | var x = 72; | Correct. | Dart |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
else
print('value') | else:
print('value') | Colon after else. | Python |
val index: Int = 'data' | val index: String = 'data' | Fix type. | Kotlin |
test | test() | Add parentheses. | Kotlin |
print('info') | print('info') | Correct. | R |
[50, 90, 62 | [50, 90, 62] | Close bracket. | Python |
if count = 50 | if count == 50 | Use ==. | Ruby |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
function bar() {{ echo 'message'; }} | function bar() {{ echo 'message'; }} | Correct. | PHP |
let data = 'result' | let data = "result" | Double quotes. | Swift |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
function render() {{
return
{{key:'message'}}
}} | function render() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
assert bar > 25 | assert bar > 25 | Correct. | Python |
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