JavaScript flatMap and fill.

Hi friends, in this article I will explain JavaScript flatMap and fill method. These two methods are array methods.

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flatMap

The flatMap() method returns a new array formed by applying a given callback function to each element of the array and then flattening the result by one level. It is identical to a map() followed by a flat() of depth 1, but slightly more efficient than calling those two methods separately.

Example

https://carbon.now.sh/

The above example returns flat the 1 depth array and multiplies with 10.

fill

The fill() method changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.length). It returns the modified array.

Example

https://carbon.now.sh/

In the above example fill with static value in the array element. 0 is the static value. 1 is the starting index 3 is the ending index. It returns [ 1, 0, 0, 4 ] .

Thank you for reading. Have a nice day!

Reference links

Array.prototype.fill()

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flatMap