Javascript:Find all words in array of sentences

find all words in array of sentences.

Code:

const sentences = [

    "I love JavaScript",

    "flatMap is useful"

];

let flattened = sentences.flatMap(item=>item.split(" "))

console.log( flattened)

Output:

[ 'I', 'love', 'JavaScript', 'flatMap', 'is', 'useful' ]

without flatMap same ouput can be obtained by first map then flat

const sentences = [

    "I love JavaScript",

    "flatMap is useful"

];

let flattened = sentences.map(item=>item.split(" ")).flat()

console.log(flattened);