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Javascript: formatting a rounded number to N decimals
... var fraction = String(absValue % power),
padding = new Array(Math.max(precision - fraction.length, 0) + 1).join('0');
result += '.' + padding + fraction;
}
return result;
}
Read the details of repeating a character using an array constructor here if you are curi...
Iterating through a JSON object
...b service or a file.
import json
def main():
# create a simple JSON array
jsonString = '{"key1":"value1","key2":"value2","key3":"value3"}'
# change the JSON string into a JSON object
jsonObject = json.loads(jsonString)
# print the keys and values
for key in jsonObject:
...
When should I use Arrow functions in ECMAScript 6?
...Script has changed quite a bit since ECMAScript 5.1 gave us the functional Array.forEach, Array.map and all of these functional programming features that have us use functions where for-loops would have been used before. Asynchronous JavaScript has taken off quite a bit. ES6 will also ship a Promise...
Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values
...
This worked for me. My dictionary had integer keys and ndarray values.
– StatsSorceress
Oct 22 '18 at 15:03
...
What is the difference between a deep copy and a shallow copy?
...
In case of shallow copy if we make any changes in array B will that be reflected in array A since A & B both point to same memory location ?
– tek3
Jan 16 '15 at 12:42
...
Java String to SHA1
...hanks to @Jon Onstott for this suggestion.
Old Answer
Convert your Byte Array to Hex String. Real's How To tells you how.
return byteArrayToHexString(md.digest(convertme))
and (copied from Real's How To)
public static String byteArrayToHexString(byte[] b) {
String result = "";
for (int i=...
Regexp Java for password validation
... I am trying to implement Regex on a password stored in a char array instead of a String because of security. But how does one apply regex to a char array?
– AgentM
Oct 8 '18 at 22:23
...
Why can't I access DateTime->date in PHP's DateTime class?
...oday but if it is a 'side effect' of var_dump() I am not so sure..
echo ((array) new DateTime())['date']; // Works in PHP 7.
What I am sure about is that if the properties of DateTime where meant to be used by us it would have been made available. But like many internal classes they are not and y...
Pandas percentage of total with groupby
...m.seed(0)
groups = [
''.join(i) for i in zip(
np.random.choice(np.array([i for i in string.ascii_lowercase]), 30000),
np.random.choice(np.array([i for i in string.ascii_lowercase]), 30000),
np.random.choice(np.array([i for i in string.ascii_lowercase]), 30000),
...
Pipe output and capture exit status in Bash
...
There is an internal Bash variable called $PIPESTATUS; it’s an array that holds the exit status of each command in your last foreground pipeline of commands.
<command> | tee out.txt ; test ${PIPESTATUS[0]} -eq 0
Or another alternative which also works with other shells (like zsh...