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Reading a delimited string into an array in Bash
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In order to convert a string into an array, please use
arr=($line)
or
read -a arr <<< $line
It is crucial not to use quotes since this does the trick.
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Given a class, see if instance has method (Ruby)
... because instance_methods changed between Ruby 1.8 and 1.9. 1.8 returns an array of strings and 1.9 returns an array of symbols. method_defined? takes a symbol in both 1.8 and 1.9.
– Jason
May 2 '12 at 17:03
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Why does struct alignment depend on whether a field type is primitive or user-defined?
...000007fe039d3b78
EEClass: 000007fe039d3ad0
Size: 40(0x28) bytes
Array: Rank 1, Number of elements 1, Type VALUETYPE
Fields:
None
We see that this is a ValueType and its the one we created. Since this is an array we need to get the ValueType def of a single element in the array:
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What exactly does the .join() method do?
...ist ["5", "9", "5"].
It appears that you're looking for + instead:
print array.array('c', random.sample(string.ascii_letters, 20 - len(strid)))
.tostring() + strid
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What's the difference between '$(this)' and 'this'?
...h the current element. This element comes from the jQuery object's element array. Each jQuery object constructed contains an array of elements which match the selectorjQuery API that was used to instantiate the jQuery object.
$(selector) calls the jQuery function (remember that $ is a reference to...
JavaScript isset() equivalent
In PHP you can do if(isset($array['foo'])) { ... } . In JavaScript you often use if(array.foo) { ... } to do the same, but this is not exactly the same statement. The condition will also evaluate to false if array.foo does exists but is false or 0 (and probably other values as well).
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How do I loop through or enumerate a JavaScript object?
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Under ECMAScript 5, you can combine Object.keys() and Array.prototype.forEach():
var obj = { first: "John", last: "Doe" };
Object.keys(obj).forEach(function(key) {
console.log(key, obj[key]);
});
ECMAScript 6 adds for...of:
for (const key of Object.keys(obj)) {
cons...
Simple way to create matrix of random numbers
... rand(d0, d1, ..., dn)
Random values in a given shape.
Create an array of the given shape and propagate it with random
samples from a uniform distribution over [0, 1).
>>> import numpy as np
>>> np.random.rand(2,3)
array([[ 0.22568268, 0.0053246 , 0.41282024],
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Ruby on Rails: Where to define global constants?
...the same as above
The two options above allow you to change the returned array on each invocation of the accessor method if required. If you have true a truly unchangeable constant, you can also define it on the model class:
class Card < ActiveRecord::Base
COLOURS = ['white', 'blue'].freeze
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Cast Int to enum in Java
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@Tarrasch as arrays are mutable, values() must return a copy of the array of elements just in case you happen to change it. Creating this copy each time is relatively expensive.
– Peter Lawrey
Dec 4 ...