Discussion on: 15 must-know JavaScript array methods in 2020

[Adam Mescher]

Greatly appreciate your effort for creating this list. It allowed me to get a stronger grasp on the language.

I would like to mention that during my research of these methods you've brought to all of our attention, I found that the flat() method takes an argument for the depth, so while you are correct that myArr.flat() will default to a depth of one, it's also possible to specify larger values, and even include an infinite option.

For example (stolen directly from the MDN web docs):

var arr3 = [1, 2, [3, 4, [5, 6]]];
arr3.flat(2); // [1, 2, 3, 4, 5, 6]

var arr4 = [1, 2, [3, 4, [5, 6, [7, 8, [9, 10]]]]];
arr4.flat(Infinity); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]