how to change data type of array in python code example

Example 1: change type of array python

arr=arr.astype('uint8')

Example 2: how to get value in array object value using for loop in javascript

const myArray = [{x:100}, {x:200}, {x:300}];

const newArray= myArray.map(element => element.x);
console.log(newArray); // [100, 200, 300]