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How do you build a Singleton in Dart?
...sible way:
void main() {
var s1 = Singleton.instance;
s1.somedata = 123;
var s2 = Singleton.instance;
print(s2.somedata); // 123
print(identical(s1, s2)); // true
print(s1 == s2); // true
//var s3 = new Singleton(); //produces a warning re missing default constructor and breaks on ...
How can I add a key/value pair to a JavaScript object?
...
what if the key is a number? obj.123 = 456 doesn't work. obj[123] = 456 does work though
– axel freudiger
Nov 2 '12 at 10:39
13
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How to re-open an issue in github?
...rence the old one (by mentioning its number preceded by a hash sign, e.g. #123).
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Clearing purchases from iOS in-app purchase sandbox for a test user
...t you don't really have to verify your test user email. you can simply put 123@123.com with specify password(that you are still going to use the password in sandbox mode) and it still work. I just tested last night.
– sooon
May 1 '14 at 12:24
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Fastest way to count exact number of rows in a very large table?
...nly speculate. Does the db maintenance process find out that there are 42,123,876 rows in table A and then create 42,123,876 empty rows in table B, and then loop through table A and update the rows in table B...? Or is it crazier than that? ;-)
– Tony Andrews
...
How to round a number to n decimal places in Java
...f.setRoundingMode(RoundingMode.CEILING);
for (Number n : Arrays.asList(12, 123.12345, 0.23, 0.1, 2341234.212431324)) {
Double d = n.doubleValue();
System.out.println(df.format(d));
}
gives the output:
12
123.1235
0.23
0.1
2341234.2125
EDIT: The original answer does not address the acc...
Converting a Java Keystore into PEM Format
...asd
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 1237334757 (0x49c03ae5)
Signature Algorithm: dsaWithSHA1
Issuer: C=AU, ST=Victoria, L=Melbourne, CN=foo.example.com
Validity
Not Before: Mar 18 00:05:57 2009 GMT
Not After : Jun...
Run an OLS regression with Pandas Data Frame
... Jarque-Bera (JB): 0.498
Skew: -0.123 Prob(JB): 0.780
Kurtosis: 1.474 Cond. No. 5.21e+04
==============================================================================
Warnings:
[1] The con...
Share variables between files in Node.js?
...e..
// main.js
var myModule = require('./module.js');
var shares = {value:123};
// Initialize module and pass the shareable object
myModule.init(shares);
// The value was changed from init2 on the other file
console.log(shares.value); // 789
On the other file..
// module.js
var shared = null;
...
When to use ref and when it is not necessary in C#
...mean it's good. It would have been better if rather than if (int.TryParse("123", out var theInt) { /* use theInt */ } we had var candidate = int.TrialParse("123"); if (candidate.Parsed) { /* do something with candidate.Value */ } It is more code, but is much more consistent with the C# language desi...