remove letters using index js code example

Example 1: remove character at index from string javascript

// removing char at index 3
var str = "Hello World";
str = str.slice(0, 3) + str.slice(4);

console.log(str)  // Helo World

Example 2: how to remove letters from an array javascript

function fromlist(l) {
  return l.filter(e => Number.isInteger(e));
}
// or this
function fromlist(l) {
  return l.filter(Number.isInteger);
}