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What is NSZombie?
...t, and turn on "enable reference counts" and "Enable NSZombie Detection". Now hit Record again in the instrument, and your app will start up - if any zombie objects are sent messages recording will stop, and a dialog box will pop up in the recording timeline - you can click on that to find every pl...
How do negative margins in CSS work and why is (margin-top:-5 != margin-bottom:5)?
...arting in the top left corner (let's stick with the vertical rendering for now, keeping in mind that the horizontal one is treated the same).
consider the following html:
<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
analogous to...
React JSX: selecting “selected” on selected option
...ange={this.handleChange} />
)
}
}
included component (which is now a stateless functional):
export const ReactExample = ({ name, value, handleChange }) => (
<select name={name} value={value} onChange={handleChange}>
<option value="A">Apple</option>
<opt...
Why are trailing commas allowed in a list?
... items.
l1 = [
1,
2,
3,
4,
5
]
# Now you want to rearrange
l1 = [
1,
2,
3,
5
4,
]
# Now you have an error
But if you allow trailing commas, and use them, you can easily rearrange the lines without introducing an er...
Too many 'if' statements?
...ne 1-digit base 4 number {0,1,2,3} -- 4 different values, also important.
Now, a 1-digit base 4 number can be expressed as a 2-digit base 2 number; {0,1,2,3} = {00,01,10,11}, and so each output can be encoded with only 2 bits. From above, there are only 16 different outputs possible, so 16*2 = 32...
Creating functions in a loop
...
how do you know how to fix these things?
– alwbtc
Aug 18 '18 at 15:49
3
...
Application Loader: “Cannot proceed with delivery: an existing transporter instance is currently upl
...hile in the middle of submitting an app to iTunes Connect.
The token files now appear in the
Library/Caches/com.apple.amp.itmstransporter/UploadTokens/ subfolder of the given user's home directory. Which, honestly, is a better place for them anyway.
Delete any .token files in this directory.
--
If...
Python progression path - From apprentice to guru
I've been learning, working, and playing with Python for a year and a half now. As a biologist slowly making the turn to bio-informatics, this language has been at the very core of all the major contributions I have made in the lab. I more or less fell in love with the way Python permits me to expre...
How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
...irst the printf and then puts and the retq return.
With __builtin_expect
Now replace if (i) with:
if (__builtin_expect(i, 0))
and we get:
0000000000000000 <main>:
0: 48 83 ec 08 sub $0x8,%rsp
4: 31 ff xor %edi,%edi
6: e8 00 0...
How to echo with different colors in the Windows command line
I know that the color bf command sets the colors of the whole command line window but I wanted to to print one single line in a different color.
...