JavaScript An array with two numbers -

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Suppose, I want an array and every array I would like the numbers in that array, like

Test [1] Output [2,1] or whatever.

I know that I only assign two numbers to a decimal such as "|" and this output would be "2 | 1" but I wanted to know whether there was an official way of adding two different numbers to an array element ...

< Arrays can also be used as value: 

  var test = [[4,

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