There is one issue with the 2nd example used in the flatmap. The .flat() call at the end isn't needed, if you run the following code you will see that it evaluates to true
JSON.stringify(myAwesomeArray.map(arr => arr * 10)) === JSON.stringify( myAwesomeArray.map(arr => arr * 10).flat())
The issue is that if you execute [1] * 10 it will return 10 and not [10] as you would expect
[1] * 10
10
[10]
There is no issue with that code. It's just two examples. The first is used with flatMap()
flatMap()
const myAwesomeArray = [[1], [2], [3], [4], [5]] myAwesomeArray.flatMap(arr => arr * 10) //-------> Output : [10, 20, 30, 40, 50]
And the second uses flat() and map().
flat()
map()
const myAwesomeArray = [[1], [2], [3], [4], [5]] // With .map() and .flat() myAwesomeArray.map(arr => arr * 10).flat() //-------> Output : [10, 20, 30, 40, 50]
As a side note, with flatMap(), the map() function is applied first and flat() comes after.
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There is one issue with the 2nd example used in the flatmap. The .flat() call at the end isn't needed, if you run the following code you will see that it evaluates to true
The issue is that if you execute
[1] * 10it will return10and not[10]as you would expectThere is no issue with that code. It's just two examples.
The first is used with
flatMap()And the second uses
flat()andmap().As a side note, with
flatMap(), themap()function is applied first andflat()comes after.