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For..In loops in JavaScript - key value pairs
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If you can use ES6 natively or with Babel (js compiler) then you could do the following:
const test = {a: 1, b: 2, c: 3};
for (const [key, value] of Object.entries(test)) {
console.log(key, value);
}
Which will print out this output:
a 1
b 2
c 3
The Object.en...
How to properly add cross-site request forgery (CSRF) token using PHP
...functions instead.
First, generate a second token for use as an HMAC key, then use logic like this to render it:
<input type="hidden" name="token" value="<?php
echo hash_hmac('sha256', '/my_form.php', $_SESSION['second_token']);
?>" />
And then using a congruent operation when ve...
Loop through a date range with JavaScript
...ng Date without the new constructor just gives you a Date string which you then convert to a Date object anyway?
– tatlar
Sep 10 '14 at 17:52
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How to execute a Ruby script in Terminal?
...t given, it would not work with above command. Check your permissions and then use the same command.
– Priti Biyani
May 4 '17 at 17:44
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Bad class file magic or version
... higher but was built using Java 6 or higher.
If you built that .jar file then you don't need to change anything in Gradle or ProGuardor Compiler Version. The solution is very simple, just build that .jar file again but using Java 5 or less.
More details.
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How to force the browser to reload cached CSS/JS files?
...aybe only a few times each month, unless you're a Google or hi5 Networks), then they are less likely to have your files in cache, and that may be enough. If you want to force a new version into the browser, you can always add a query string to the request, and bump up the version number when you ma...
What is the difference between substr and substring?
... developing Java applets. ('Almost', because we had to worry about IE back then.)
– Michael Scheper
Jul 19 '16 at 10:22
3
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Group by in LINQ
...yPersonId = persons.ToLookup(p => p.PersonId, p => p.car);
You can then get the cars for each person very easily:
// This will be an empty sequence for any personId not in the lookup
var carsForPerson = carsByPersonId[personId];
...
Filtering Pandas DataFrames on dates
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If date column is the index, then use .loc for label based indexing or .iloc for positional indexing.
For example:
df.loc['2014-01-01':'2014-02-01']
See details here http://pandas.pydata.org/pandas-docs/stable/dsintro.html#indexing-selection
If the ...
How to sort a list of strings?
...rints None. If you saved your list to a variable, say x, called x.sort(), then print(x), you would see the sorted list.
– bjg222
Dec 30 '17 at 20:19
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