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What does the “|” (single pipe) do in JavaScript?
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159
This is a bitwise or.
Since bitwise operations only make sense on integers, 0.5 is truncated.
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Regular expressions in C: examples?
...s):
#include <regex.h>
regex_t regex;
int reti;
char msgbuf[100];
/* Compile regular expression */
reti = regcomp(&regex, "^a[[:alnum:]]", 0);
if (reti) {
fprintf(stderr, "Could not compile regex\n");
exit(1);
}
/* Execute regular expression */
reti = regexec(&regex,...
leading zeros in rails
...min , both integers in my application. For hr field, if the user enters "1" I would like Rails to automatically pad it to "01" before saving it to the database. Also for the min field if the user enter "0" it should put in as "00".
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Uninstall old versions of Ruby gems
...# choose which ones you want to remove
gem uninstall rjb
# remove version 1.1.9 only
gem uninstall rjb --version 1.1.9
# remove all versions less than 1.3.4
gem uninstall rjb --version '<1.3.4'
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Specifying rails version to use when creating a new application
I have two versions of rails (2.1.0 and 2.2.2) installed in my computer.
7 Answers
7
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How can I replace a regex substring match in Javascript?
That replaces the entire string str with 1 . I want it to replace the matched substring instead of the whole string. Is this possible in Javascript?
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Integrate ZXing in Android Studio
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edited May 4 '18 at 4:11
Faysal Ahmed
5,78655 gold badges2121 silver badges4040 bronze badges
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How to convert a string or integer to binary in Ruby?
...a string representing the number in the base specified:
9.to_s(2) #=> "1001"
while the reverse is obtained with String#to_i(base):
"1001".to_i(2) #=> 9
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Algorithm for Determining Tic Tac Toe Game Over
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133
You know a winning move can only happen after X or O has made their most recent move, so you c...
Python - abs vs fabs
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127
math.fabs() converts its argument to float if it can (if it can't, it throws an exception). It...