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Correct way to populate an Array with a Range in Ruby
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You can create an array with a range using splat,
>> a=*(1..10)
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
using Kernel Array method,
Array (1..10)
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
or using to_a
(1..10).to_a
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
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Postgres unique constraint vs index
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Let's check uniqueness, just in case.
test=# insert into master values (0, 0);
INSERT 0 1
test=# insert into master values (0, 1);
ERROR: duplicate key value violates unique constraint "master_con_id_key"
DETAIL: Key (con_id)=(0) already exists.
test=# insert into master values (1, 0);
ERROR: ...
How to update maven repository in Eclipse?
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107
You can right-click on your project then Maven > Update Project..., then select Force Update...
Is PHP's count() function O(1) or O(n) for arrays?
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edited Apr 20 '13 at 22:03
John Carter
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How to execute a java .class from the command line
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edited May 23 '17 at 10:31
Community♦
111 silver badge
answered Aug 14 '09 at 18:53
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HTML anchor link - href and onclick both?
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130
Just return true instead?
The return value from the onClick code is what determines whether the...
relative path in require_once doesn't work
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answered Mar 20 '11 at 22:09
RaisenRaisen
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How to set current working directory to the directory of the script in bash?
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#!/bin/bash
cd "$(dirname "$0")"
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Delete specific line number(s) from a text file using sed?
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If you want to delete lines 5 through 10 and 12:
sed -e '5,10d;12d' file
This will print the results to the screen. If you want to save the results to the same file:
sed -i.bak -e '5,10d;12d' file
This will back the file up to file.bak, and delete the given ...