wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
let bar: Int = 'result' | let bar: String = 'result' | Fix type. | Swift |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
def compute():
print('value') | def compute():
print('value') | Indent function body. | Python |
let str = String::from("output"); let ref=&str; str.push_str("!"); | let mut str = String::from("output"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
echo result hello | echo 'result hello' | Quote to prevent splitting. | Shell |
if index = 71 {{}} | if index == 71 {{}} | Use ==. | Swift |
if [ $a = 75 ]; then | if [ "$a" = 75 ]; then | Quote variable. | Shell |
if ($val = 81) {{}} | if ($val -eq 81) {{}} | Use -eq. | PowerShell |
SELECT id role FROM orders; | SELECT id, role FROM orders; | Add comma. | SQL |
z > 24 & a < 45 | z > 24 and a < 45 | Use 'and' not '&'. | Python |
data[97] | if (length(data) >= 97) data[97] | Check length. | R |
'77' + 74 | 77 + 74 | Avoid string coercion. | JavaScript |
my @arr = (14,90,87); | my @arr = (14,90,87); | Correct. | Perl |
<person><desc>message</desc><desc>23</desc></person | <person><desc>message</desc><desc>23</desc></person> | Add closing >. | XML |
const p:Person = {{name:'info'}}; | const p:Person = {{name:'info', age:14}}; | Add missing property. | TypeScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
{{"name":"message" "title":72}} | {{"name":"message", "title":72}} | Add comma. | JSON |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<note name='output'/> | <note name="output"/> | Double quotes. | XML |
print 'result' | print 'result'; | Add semicolon. | Perl |
let vec=vec![88,88,4]; let first=&vec[0]; vec.push(84); | let mut vec=vec![88,88,4]; let first=vec[0]; vec.push(84); | Copy instead of reference. | Rust |
if b > 50
print('hello') | if b > 50:
print('hello') | Colon missing after if. | Python |
class Item {{ int b; }}; | class Item {{ public: int b; }}; | Make public. | C++ |
{{'id':'test'}} | {{"id":"test"}} | Use double quotes. | JSON |
function compute() {{
return
{{key:'info'}}
}} | function compute() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
if index = 36 | if index == 36 | Use ==. | MATLAB |
{{'value':37, 'title' 19}} | {{'value':37, 'title':19}} | Colon missing. | Python |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
bar = test | bar = 'test' | Quote strings. | Python |
result = 56 | result=56 | No spaces. | Shell |
let val: number | null = null; val.toFixed(40); | let val: number | null = null; if(val!==null) val.toFixed(40); | Null check. | TypeScript |
items(67) | if length(items) >= 67, items(67), end | Check length. | MATLAB |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let mut b=49; let r1=&mut b; let ref2=&mut b; | let mut b=49; {{ let r1=&mut b; }} let ref2=&mut b; | Only one mutable borrow. | Rust |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
h1 {{ font-size:17px color:blue; }} | h1 {{ font-size:17px; color:blue; }} | Add semicolon. | CSS |
UPDATE items SET age='value' WHERE status=63 | UPDATE items SET age='value' WHERE status=63; | Add semicolon. | SQL |
def baz(data):
return data + 1 | def baz(data):
return data + 1 | Correct. | Python |
sys.sqrt(72) | import sys
sys.sqrt(72) | Import module first. | Python |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
data[40] | if data.indices.contains(40) {{ data[40] }} | Check index. | Swift |
let y = 'value' | let y = "value" | Double quotes. | Swift |
INSERT INTO items VALUES ('data',6) | INSERT INTO items (name, email) VALUES ('data',6); | Specify columns. | SQL |
for (int i=0; i<56; i++) {{}} | for (int i=0; i<56; i++) {{}} | Correct. | Java |
function render(b:string){{return b;}} render(46); | function render(b:string){{return b;}} render('message'); | Pass correct type. | TypeScript |
int list[88]; list[88]=5; | int list[88]; if(88<88){{}} else list[88]=5; | Bounds check. | C++ |
x := 100 | x := 100 | Correct. | Go |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let foo: number = 'test'; | let foo: string = 'test'; | Fix type. | TypeScript |
let s1 = String::from("result"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("result"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
assert a > 74 | assert a > 74 | Correct. | Python |
if ($b = 61) | if ($b == 61) | Use ==. | Perl |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
disp('value') | disp('value') | Correct. | MATLAB |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
const temp; | const temp = 54; | Initialize const. | JavaScript |
if (c = 59) | if (c == 59) | Use ==. | R |
if (b = 44) {{}} | if (b === 44) {{}} | Use === for equality. | JavaScript |
compute | compute() | Add parentheses. | Kotlin |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
if val = 71: | if val == 71: | Use == for comparison. | Python |
<table><tr><td>data<td>hello</tr></table> | <table><tr><td>data</td><td>hello</td></tr></table> | Close td. | HTML |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
$arr[68] | if ($arr.Count -gt 68) {{ $arr[68] }} | Check bounds. | PowerShell |
String bar = 'value'; | String bar = "value"; | Double quotes. | Java |
[26, 94, 84 | [26, 94, 84] | Close bracket. | Ruby |
val a: Int = 'data' | val a: String = 'data' | Fix type. | Kotlin |
class Product {{ int temp; }}
obj.temp=5; | class Product {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
if index > 9
puts 'value' | if index > 9
puts 'value'
end | Add 'end'. | Ruby |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
int[] items = new int[30];
items[30] = 5; | int[] items = new int[30];
if (30 < items.length) items[30] = 5; | Check bounds. | Java |
<p>value <b>data</p></b> | <p>value <b>data</b></p> | Nest properly. | HTML |
if (c = 66) {{}} | if (c == 66) {{}} | Use ==. | Java |
for (result in list) | for (result of list) | for...in iterates keys. | JavaScript |
SELECT * FROM orders WHRE age=24; | SELECT * FROM orders WHERE age=24; | Fix WHERE. | SQL |
var c int = 'value' | var c string = 'value' | Type mismatch. | Go |
class Item {{ int x; }}; | class Item {{ public: int x; }}; | Make public. | C++ |
{{"value":"hello" "id":73}} | {{"value":"hello", "id":73}} | Add comma. | JSON |
if ($z = 18) | if ($z == 18) | Use ==. | Perl |
'18' + 17 | 18 + 17 | Avoid string coercion. | JavaScript |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
.Order {{ color: blue; }} | .Order {{ color: blue; }} | Correct. | CSS |
let mut z=46; let r1=&mut z; let r2=&mut z; | let mut z=46; {{ let r1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
<p>message <b>data</p></b> | <p>message <b>data</b></p> | Nest properly. | HTML |
cin >> val; | int val;
cin >> val; | Declare variable. | C++ |
result == '100' | result === 100 | Use strict equality. | JavaScript |
int[] arr = new int[29];
arr[29] = 5; | int[] arr = new int[29];
if (29 < arr.length) arr[29] = 5; | Check bounds. | Java |
#footer {{ color: green; }} | #footer {{ color: green; }} | Correct. | CSS |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
a = 46 | a=46 | No spaces. | Shell |
[52, 60, 11 | [52, 60, 11] | Close bracket. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
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