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Which equals operator (== vs ===) should be used in JavaScript comparisons?
...n the third rule)
Now it becomes interesting:
var a = "12" + "3";
var b = "123";
alert(a === b); // returns true, because strings behave like value types
But how about this?:
var a = new String("123");
var b = "123";
alert(a === b); // returns false !! (but they are equal and of the same type)
I...
Retrieving parameters from a URL
...
import urlparse
url = 'http://example.com/?q=abc&p=123'
par = urlparse.parse_qs(urlparse.urlparse(url).query)
print par['q'][0], par['p'][0]
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...
Summarizing multiple columns with dplyr? [duplicate]
...brary(dplyr)
library(purrrlyr)
library(data.table)
library(bench)
set.seed(123)
n <- 10000
df <- data.frame(
a = sample(1:5, n, replace = TRUE),
b = sample(1:5, n, replace = TRUE),
c = sample(1:5, n, replace = TRUE),
d = sample(1:5, n, replace = TRUE),
grp = sample(1:3, n, replac...
C++ protobuf使用入门实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ze------
google::protobuf::TestValue msg_val;
msg_val.set_number_value(123.f);
std::string str = msg_val.SerializeAsString();
std::cout << "--------- len:" << str.length() << ":" << str << std::endl;
google::protobuf::Test message;
message.mutable_fields()->operator []("test") = msg_va...
Write a number with two decimal places SQL server
...ters to display, and the number of decimal places to display
Select Str(12345.6789, 12, 3)
displays: ' 12345.679' ( 3 spaces, 5 digits 12345, a decimal point, and three decimal digits (679). - it rounds if it has to truncate, (unless the integer part is too large for the total size, in whic...
Map vs Object in JavaScript
...d Symbol keys where as Maps support more or less any key type.
If I do obj[123] = true and then Object.keys(obj) then I will get ["123"] rather than [123]. A Map would preserve the type of the key and return [123] which is great. Maps also allow you to use Objects as keys. Traditionally to do this y...
How to format numbers as currency string?
... id="x"&gt;(press button to get output)&lt;/p&gt;
Use it like so:
(123456789.12345).formatMoney(2, ".", ",");
If you're always going to use '.' and ',', you can leave them off your method call, and the method will default them for you.
(123456789.12345).formatMoney(2);
If your culture h...
Jackson JSON custom serialization for certain fields
...ill result in the desired output
{"name":"Joe","age":25,"favoriteNumber":"123"}
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How to create a new database using SQLAlchemy?
...
123
SQLAlchemy-Utils provides custom data types and various utility functions for SQLAlchemy. You ...
How to show full object in Chrome console?
...null,4));
}
// how to call it
let obj = { a: 1, b: [2,3] };
print('hello',123,obj);
will output in console:
[
"hello",
123,
{
"a": 1,
"b": [
2,
3
]
}
]
sha...