how to clear the const array in state from typescript code example

Example 1: javascript empty array

arr = [];   // set array=[]

//function
const empty = arr => arr.length = 0;
//example
var arr= [1,2,3,4,5];
empty(arr) // arr=[]

Example 2: empty array javascript

// set array
arr = [1,2,4];

// empty array
arr = [];