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What is the explanation for these bizarre JavaScript behaviours mentioned in the 'Wat' talk for Code
... |
| false | “false” | 0 |
| 123 | “123” | 123 |
| [] | “” | 0 |
| {} | “[object Object]” | NaN |
+-----------------+-------------------+--------...
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...
Get css top value as number not as string?
...css(prop)) || 0;
};
Usage:
$('#elem').cssInt('top'); // e.g. returns 123 as an int
$('#elem').cssFloat('top'); // e.g. Returns 123.45 as a float
Test fiddle on http://jsfiddle.net/TrueBlueAussie/E5LTu/
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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...
App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...建点击数字过程按照计算器的使用习惯，如果要输入数字123，会依次点击三个数字键，但三个数字的排列要用程序来处理，这里存在两种情况：当后数=0时，即，当用户输入第一个数字时，让后数直接等于输入的数字；当用户接...
C# member variable initialization; best practice?
...it : base() unless you add something more specific - which could be : base(123, "abc"), or could be : this(123, "abc").
– Marc Gravell♦
Sep 22 '12 at 9:51
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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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How to trigger a phone call when clicking a link in a web page on mobile phone
...e proper URL scheme is tel:[number] so you would do
<a href="tel:5551234567"><img src="callme.jpg" /></a>
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JavaScript equivalent of jQuery's extend method
...42,
prop3: true,
prop4: 20.16,
};
const obj2 = {
prop4: 77.123,
propNew1: 'newVal1',
propNew2: 71,
};
assert.deepEqual(utils.extend(obj1, obj2), {
prop1: 'val1',
prop2: 42,
prop3: true,
prop4: 77.123,
propNew1: 'newVal1',
propNew2: 71,
});
});
i...
Why is it slower to iterate over a small string than a small list?
...rule out Tim Peter's 10-times-upvoted answer!
>>> foo = iterable[123]
>>> iterable[36] is foo
True
These are not new objects!
But this is worth mentioning: indexing costs. The difference will likely be in the indexing, so remove the iteration and just index:
>>> pytho...