Sometimes, we want to initialize an array with a single value with JavaScript.
In this article, we’ll look at how to initialize an array with a single value with JavaScript.
How to initialize an array with a single value with JavaScript?
To initialize an array with a single value with JavaScript, we can create an empty array and then call map to map each entry to the value we want.
For instance, we write
const arr = [...new Array(1000000)].map(() => 42);
to create array arr with length 1000000.
And then we call map with a callback that maps each entry to 42.
Then arr has 1000000 42’s in it.
Conclusion
To initialize an array with a single value with JavaScript, we can create an empty array and then call map to map each entry to the value we want.
