TypedArray.from()

const uint16 = Int16Array.from("12345");

console.log(uint16);
// : Int16Array [1, 2, 3, 4, 5]

TypedArray.from(arrayLike, mapFn)
TypedArray.from(arrayLike, mapFn, thisArg)

const s = new Set([1, 2, 3]);
Uint8Array.from(s);
// Uint8Array [ 1, 2, 3 ]

Int16Array.from("123");
// Int16Array [ 1, 2, 3 ]

Float32Array.from([1, 2, 3], (x) => x + x);
// Float32Array [ 2, 4, 6 ]

Uint8Array.from({ length: 5 }, (v, k) => k);
// Uint8Array [ 0, 1, 2, 3, 4 ]

function NotArray(len) {
  console.log("NotArray called with length", len);
}

Int8Array.from.call({}, []); // TypeError: #<Object> is not a constructor
Int8Array.from.call(NotArray, []);
// NotArray called with length 0
// TypeError: Method %TypedArray%.from called on incompatible receiver #<NotArray>

function NotArray2(len) {
  console.log("NotArray2 called with length", len);
  return new Uint8Array(len);
}
console.log(Int8Array.from.call(NotArray2, [1, 2, 3]));
// NotArray2 called with length 3
// Uint8Array(3) [ 1, 2, 3 ]