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Check if object value exists within a Javascript array of objects and if not add a new object to arr
...nst arr = [{ id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 3, username: 'ted' }];
function add(arr, name) {
const { length } = arr;
const id = length + 1;
const found = arr.some(el => el.username === name);
if (!found) arr.push({ id, username: name });
return arr...
How to join two generators in Python?
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answered Jul 9 '10 at 8:30
PhilippPhilipp
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How to get a random number in Ruby
... them with:
10.times.map{ 20 + Random.rand(11) }
#=> [26, 26, 22, 20, 30, 26, 23, 23, 25, 22]
Note:
Using Random.new.rand(20..30) (using Random.new) generally would not be a good idea, as explained in detail (again) by Marc-André Lafortune, in his answer (again).
But if you don't use Rand...
What's the opposite of head? I want all but the first N lines of a file
...tput lines starting with the Kth
So to filter out the first 2 lines, -n +3 should give you the output you are looking for (start from 3rd).
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Generate random int value from 3 to 6
...ossible in Microsoft SQL Server generate random int value from Min to Max (3-9 example, 15-99 e.t.c)
10 Answers
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What is NSLayoutConstraint “UIView-Encapsulated-Layout-Height” and how should I go about forcing it
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How to get the sizes of the tables of a MySQL database?
... George Garchagudashvili
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answered Mar 8 '12 at 15:34
ChapMicChapMic
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How to test which port MySQL is running on and whether it can be connected to?
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13 Answers
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Changing element style attribute dynamically using JavaScript
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edited Nov 13 '15 at 16:26
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