How to initialize all members of an array to the same value in typescript?

Question

In C Language int myArray[42] = { 0 }; initialises all the values of the array to 0 at the start. Is there any similar way that we can do in typescript?

Answer 1

You can use Array.prototype.fill()

The fill() method fills all the elements of an array from a start index to an end index with a static value.

var arr = new Array(30);
arr.fill(0); // Fills all elements of array with 0

Answer 2

In C Language int myArray[42] = { 0 }; initialises all the values of the array to 0 at the start. Is there any similar way that we can do in typescript

In JavaScript latest you can use Array.from :

Array.from({length:10}); // Array of `undefined x 10`

Of course you can make it something else too:

Array.from({length:10}).map(x=>0); // Array of `0 x 10`

More

• https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/from

• use lib option : https://basarat.gitbooks.io/typescript/content/docs/types/lib.d.ts.html#lib-option