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In Ruby, the array subtraction or reject
>> [1,3,5,7,7] - [7]
=> [1, 3, 5]
>> [1,3,5,7,7].reject{|i| i == 7}
=> [1, 3, 5]
will remove all entries in the array. Is there an easy to remove just 1 occurrence?
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Ruby | Array delete() operation Array#delete() : delete() is a Array class method which returns the array after deleting the mentioned elements. It can also delete a particular element in the array. Syntax: Array. delete() Parameter: obj - specific element to delete Return: last deleted values from the array.
slice() in Ruby? The array. slice() is a method in Ruby that is used to return a sub-array of an array. It does this either by giving the index of the element or by providing the index position and the range of elements to return.
The . last property of an array in Ruby returns the last element of the array.
To remove the first element of an array,we need to use Array.shift or Array.shift () command. Here is my example using the Array A. A.shift () should remove the first element of A which is 1 and it should return A = [2,3,4,5,6] To remove the last element of an array,we can use the Array.pop or Array.pop () command.
The command is Array.delete_at (Array.index (value)) will remove the first occurance of a repeating value from the array. I have applied that to A below.
You need to use Array.delete (value) . The command will remove all the elements of the array which matches the value. So be careful with it. If you just want to remove the first occurance of a repeating value, please read the next tutorial. Here is my example using Array A I need to remove the value 3 from my array. So I call A.delete (3).
Here also, you don't need to pass any argument because whichever element is found by the method as the first element will be removed. In the article, we will discuss two more such methods which will help us to remove the elements from the Array and they are namely Array.delete () and Array.delete_at ().
>> a = [1,3,5,7,7]
>> a.slice!(a.index(7))
=> 7
>> a
=> [1,3,5,7]
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