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Trying to filter some entries from an array. It's not guaranteed they are in the master array, so I'm testing through an iteration.
total = ['alpha', 'bravo', 'charlie', 'delta', 'echo'] hide = ['charlie', 'echo'] pick = [] for i in total if !hide.include?(i) puts i pick.push(i) end end puts pick This isn't working. Is there a better way of providing this kind of filter?
259
asked Sep 07 '15 10:09
If you want to remove an item from an array, you can use the pop() method to remove the last element or the shift() method to remove the first element.
You can remove the element at any index by using the splice method. If you have an array named arr it can be used in this way to remove an element at any index: arr. splice(n, 1) , with n being the index of the element to remove.
We can use the following JavaScript methods to remove an array element by its value. indexOf() – function is used to find array index number of given value. Return negavie number if the matching element not found. splice() function is used to delete a particular index value and return updated array.
Ruby lets you use public instance methods on two arrays to get their intersecting or exclusive elements:
a1 = ['alpha', 'bravo', 'charlie', 'delta', 'echo'] a2 = ['charlie', 'echo'] puts a1 - a2 => ['alpha', 'bravo', 'delta'] puts a1 & a2 => ['charlie', 'echo'] For more information check rubydoc Array. It's likely that you'll find exactly what you need there.
112
answered Sep 22 '22 06:09
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