Just use Array#sample: [:foo, :bar].sample # => :foo, or :bar 🙂 It is available in Ruby 1.9.1+. To be also able to use it with an earlier version of Ruby, you could require “backports/1.9.1/array/sample”. Note that in Ruby 1.8.7 it exists under the unfortunate name choice; it was renamed in later version so you shouldn’t … Read more
Depends on your priorities. If performance is your absolute driving characteristic, then by all means use the fastest one. Just make sure you have a full understanding of the differences before you make a choice Unlike serialize() you need to add extra parameter to keep UTF-8 characters untouched: json_encode($array, JSON_UNESCAPED_UNICODE) (otherwise it converts UTF-8 characters … Read more
Use df.to_numpy() It’s better than df.values, here’s why.* It’s time to deprecate your usage of values and as_matrix(). pandas v0.24.0 introduced two new methods for obtaining NumPy arrays from pandas objects: to_numpy(), which is defined on Index, Series, and DataFrame objects, and array, which is defined on Index and Series objects only. If you visit … Read more
You want to do the check for undefined first. If you do it the other way round, it will generate an error if the array is undefined. if (array === undefined || array.length == 0) { // array does not exist or is empty } Update This answer is getting a fair amount of attention, … Read more
You can do this way – int[] terms = new int[400]; for (int runs = 0; runs < 400; runs++) { terms[runs] = value; } Alternatively, you can use Lists – the advantage with lists being, you don’t need to know the array size when instantiating the list. List<int> termsList = new List<int>(); for (int … Read more
Same way as you would in JavaScript. delete myArray[key]; Note that this sets the element to undefined. Better to use the Array.prototype.splice function: const index = myArray.indexOf(key, 0); if (index > -1) { myArray.splice(index, 1); }
This approach has the advantage of not needing to loop over all the elements (at least not explicitly). But since array_to_string_internal() in array.c still loops over array elements and concatenates them into a string, it’s probably not more efficient than the looping solutions proposed, but it’s more readable. if [[ ” ${array[*]} ” =~ ” … Read more
If you mean a C-style array, then you can do something like: int a[7]; std::cout << “Length of array = ” << (sizeof(a)/sizeof(*a)) << std::endl; This doesn’t work on pointers (i.e. it won’t work for either of the following): int *p = new int[7]; std::cout << “Length of array = ” << (sizeof(p)/sizeof(*p)) << std::endl; … Read more
Array.prototype.pop() by JavaScript convention. let fruit = [‘apple’, ‘orange’, ‘banana’, ‘tomato’]; let popped = fruit.pop(); console.log(popped); // “tomato” console.log(fruit); // [“apple”, “orange”, “banana”]
m(new String[]{“blah”, “hey”, “yo”});