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An “and” operator for an “if” statement in Bash
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edited Nov 15 '19 at 20:51
answered Nov 16 '12 at 0:22
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What does the leading semicolon in JavaScript libraries do?
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140
It allows you to safely concatenate several JavaScript files into one, to serve it quicker as ...
MySQL - Make an existing Field Unique
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301
ALTER IGNORE TABLE mytbl ADD UNIQUE (columnName);
For MySQL 5.7.4 or later:
ALTER TABLE myt...
How to convert a ruby hash object to JSON?
...thod `to_json' for {:make=>"bmw", :year=>"2003"}:Hash
# from (irb):11
# from /usr/bin/irb:12:in `<main>'
require 'json'
# => true
car.to_json
# => "{"make":"bmw","year":"2003"}"
As you can see, requiring json has magically brought method to_json to our Hash.
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How to automatically start a service when running a docker container?
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11 Answers
11
Active
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JMS Topic vs Queues
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148
That means a topic is appropriate. A queue means a message goes to one and only one possible s...
Joda-Time: what's the difference between Period, Interval and Duration?
...g chronology and time zone) it is relative to. e.g. consider the period of 1 year, if we add this to January 1st we will always arrive at the next January 1st but the duration will depend on whether the intervening year is a leap year or not. Similarly if we add 1 month to the 1st of a month then we...
curl -GET and -X GET
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edited Feb 7 '19 at 22:16
answered Dec 14 '11 at 9:20
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Why are margin/padding percentages in CSS always calculated against width?
...is defined by the height of the
children. If an element has padding-top: 10% (relative to parent
height), that is going to affect the height of the parent. Since the
height of the child is dependent on the height of the parent, and the
height of the parent is dependent on the height of the c...