Remove duplicate pairs from an array of arrays

Question

I have an array of pairs like the example below:

array = [["human KIR2DS1", 446.0], ["mouse BMP-4", 446.0], ["mouse BMP-4", 446.0], ["mTIMP2 lot DAAP01", "435a"], ["hKIR3DL3 lot DDBL01", "435a"]]

I want to remove the duplicate pairs in the array. What is the shortest method to do this?

How about using a Set instead so there's never a need to remove duplicates? — Mark Thomas
– Mark Thomas, Commented Mar 3, 2014 at 19:53

Agis · Accepted Answer · 2014-03-03 19:40:43Z

3

Use Array#uniq:

array.uniq
# => [["human KIR2DS1", 446.0], ["mouse BMP-4", 446.0], ["mTIMP2 lot DAAP01", "435a"], ["hKIR3DL3 lot DDBL01", "435a"]]

or if you want to modify the original array:

array.uniq!
array # => [["human KIR2DS1", 446.0], ["mouse BMP-4", 446.0], ["mTIMP2 lot DAAP01", "435a"], ["hKIR3DL3 lot DDBL01", "435a"]]

answered Mar 3, 2014 at 19:40

Agis

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Agis Over a year ago

It compares the elements using #hash and #eql? methods, so you can use it for the basic data types and structures (int, hashes, arrays, floats, strings). If you use custom objects though, you have to define these two methods in order for the uniq to work. Refer to ruby-forum.com/topic/129677

Richard Rosario · Accepted Answer · 2018-07-13 08:17:19Z

0

also this can be used to sort out the duplicate and return a new Set of array wihtout duplicate. I use the spread operator "..."

function unique(array) {
    return [...new Set(array)];
}

answered Jul 13, 2018 at 8:17

Richard Rosario

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