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How to design a multi-user ajax web application to be concurrently safe
...x is acquired
Server receives "Hey, I know artifact x's state from version 123, let me set it to value foo pls."
If the Serverside version of artifact x is equal (can not be less) than 123 the new value is accepted, a new version id of 124 generated.
The new state-information "updated to version 124...
Copy a variable's value into another
...your top-level object. For example, given this object:
var obj = {
w: 123,
x: {
y: 456,
z: 789
}
};
If you do a shallow copy of that object, then the x property of your new object is the same x object from the original:
var copy = $.extend( {}, obj );
copy.w = 321;
co...
Why is string concatenation faster than array join?
...and maybe other.
a = {
nodeA: 'abc',
nodeB: 'def'
}
And b = a.concat('123')
b = {
nodeA: a, /* {
nodeA: 'abc',
nodeB: 'def'
} */
nodeB: '123'
}
So in the simplest case the VM has to do nearly no work. The only problem is that this slows down...
Set Page title using UI-Router
... return `Bar Code ${params.code}`;
}
});
For the URL path /bar/code/123 that would show "Bar Code 123" as the page title. Note that I'm using ECMAScript 6 syntax to format the string and extract params.code.
It would be nice if someone who had the time would put something like this into a di...
How can I get a user's media from Instagram without authenticating as a user?
...nsocial.googleusercontent.com/gadgets/proxy?container=none&url=https://www.instagram.com/" + name + "/", function(html) {
if (html) {
var regex = /_sharedData = ({.*);<\/script>/m,
json = JSON.parse(regex.exec(html)[1]),
edges = json.entry_data.ProfilePage[0].graphq...
Find element's index in pandas Series
... [122]: myseries = pd.Series([1,7,0,7,5], index=['a','b','c','d','e'])
In [123]: list(myseries[myseries==7].index)
Out[123]: ['b', 'd']
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How to deal with floating point number precision in JavaScript?
...OfDecimals(Y) = ExpectedNumberOfDecimals. That is to say that if we have 0.123 * 0.12 then we know that there will be 5 decimal places because 0.123 has 3 decimal places and 0.12 has two. Thus if JavaScript gave us a number like 0.014760000002 we can safely round to the 5th decimal place without fea...
How to capitalize the first letter in a String in Ruby
..."hello".capitalize #=> "Hello"
"HELLO".capitalize #=> "Hello"
"123ABC".capitalize #=> "123abc"
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Java: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification
...debug parameters to see remote "Certificate chain" in logs, then grep the "CN" in truststore explicitly passed (instead of default) as follows, if not present, you need to add. ssllabs.com/ssltest/analyze.html will show if server side certs has incomplete chain, and includes intermediate certificati...
html - table row like a link
...hn Smith</a></td>
<td><a href="person1.html">123 Fake St</a></td>
<td><a href="person1.html">90210</a></td>
</tr>
<tr>
<td><a href="person2.html">Peter Nguyen</a></td>
<...