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JavaScript, elegant way to check nested object properties for null/undefined [duplicate]
...it hits an undefined that just gets passed all the way through and the result is undefined.
– James Montagne
May 22 '14 at 14:27
1
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Creating JS object with Object.create(null)?
... !!p[key] works good with Object.create(null). But hasKey = (key, input) => Object.prototype.hasOwnProperty.call(input, key) is not bad either
– andreid
May 2 '18 at 10:03
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How do I pick randomly from an array?
...s. Basically, I want to pick a random element from an array of variable length. Normally, I would do it like this:
6 Answe...
Minimizing NExpectation for a custom distribution in Mathematica
...oks like
Plot[pdf2[3.77, 1.34, -2.65, 0.40, x]*x, {x, 0, .3}, PlotRange -> All]
and the expected value is
NIntegrate[pdf2[3.77, 1.34, -2.65, 0.40, x]*x, {x, 0, \[Infinity]}]
Out= 0.0596504
But since you want the expected value between a start and +inf we need to integrate in this range, a...
Are 2^n and n*2^n in the same time complexity?
...However, I think it's true that you can show that f(x) = O(g(x)) if lim(x->infinity) f(x)/g(x) exists.
– chepner
Feb 13 '14 at 20:53
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Using TortoiseSVN how do I merge changes from the trunk to a branch and vice versa?
...ore of a dummies guide...
You can do this either way round to go trunk -> branch or branch -> trunk. I always first do trunk -> branch fix any conflicts there and then merge branch -> trunk.
Merge trunk into a branch / tag
Checkout the branch / tag
Right-click on the root of the bra...
Event listener for when element becomes visible?
...ement
}
var observer = new IntersectionObserver((entries, observer) => {
entries.forEach(entry => {
callback(entry.intersectionRatio > 0);
});
}, options);
observer.observe(element);
}
In action: https://jsfiddle.net/elmarj/u35tez5n/5/
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How to disable word-wrap in Xcode 4 editor?
...
Go to Xcode Preferences -> Text Editing -> Indentation and deselect Line wrapping.
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Why are floating point numbers inaccurate?
....
When we call that function with our example, 9.2, here's what we get:
>>> float_to_bin_parts(9.2)
['0', '10000000010', '0010011001100110011001100110011001100110011001100110']
Interpreting the Data
You'll see I've split the return value into three components. These components are:
...
How to resize Image in Android?
... photoH = bmOptions.outHeight;
int scaleFactor = 1;
if ((targetW > 0) || (targetH > 0)) {
scaleFactor = Math.min(photoW/targetW, photoH/targetH);
}
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = ...