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Round to at most 2 decimal places (only if necessary)
... You've 'solved' the 1.005 'problem', but introduced a new one: now, in the Chrome console, roundToTwo(1.0049999999999999) comes out as 1.01 (inevitably, since 1.0049999999999999 == 1.005). It seems to me that the float you get if you type num = 1.005 'obviously' 'should' round to 1.00, b...
How to check if a given directory exists in Ruby
...d method `exists?' for Dir:Class (NoMethodError). Also, the plural form is now deprecated, use .exist? instead.
– Josip Rodin
Oct 22 '15 at 9:09
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Why start an ArrayList with an initial capacity?
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If you know in advance what the size of the ArrayList is going to be, it is more efficient to specify the initial capacity. If you don't do this, the internal array will have to be repeatedly reallocated as the list grows.
The large...
How to get ID of the last updated row in MySQL?
...DATE table SET id=LAST_INSERT_ID(id), row='value' WHERE other_row='blah';. Now, SELECT LAST_INSERT_ID(); will return the updated id. See newtover's answer for more details.
– Joel
Jun 2 '14 at 14:35
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int a[] = {1,2,}; Weird comma allowed. Any particular reason?
...mmas. Basically it means there's a uniformity in how you treat the lines.
Now think about generating code. Something like (pseudo-code):
output("int a[] = {");
for (int i = 0; i < items.length; i++) {
output("%s, ", items[i]);
}
output("};");
No need to worry about whether the current ite...
Is there a difference between using a dict literal and a dict constructor?
...essage if the number of keys exceeds 256.
I prefer using the dict literal now.
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Practical uses of different data structures [closed]
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@TonyL. I know this is an older question, but I believe 2 stacks are used or Undo/Redo. When you undo an action it is popped off the action stack and placed on the Redo Stack. If you redo, you then pop it off the Redo Stack and push it ...
How to calculate an angle from three points? [closed]
... answer, I posted before thinking my problem through. I got it figured out now, though.
– nicoco
Sep 28 '17 at 15:11
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What is the difference between memoization and dynamic programming?
...recurses down to solve the sub-problems).
A good slide from here (link is now dead, slide is still good though):
If all subproblems must be solved at least once, a bottom-up dynamic-programming algorithm usually outperforms a top-down memoized algorithm by a constant factor
No overhe...
What is the difference between Serialization and Marshaling?
I know that in terms of several distributed techniques (such as RPC), the term "Marshaling" is used but don't understand how it differs from Serialization. Aren't they both transforming objects into series of bits?
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