Removing an element from an array after clearing its value

March 23, 2022

I am trying to remove an element index from an array once I clear its value.

const myArray:string[] = ['123456', '234567']

const editedArray = myArray.map((m) => {
     if('123456' !== m) return m;
     return '';

const myArray = editedArray; // I want to return ['234567'] not ['', '234567]

// Type '(string | undefined)[]' is not assignable to type 'string[]'.

>Solution :

map will always return an array with the same number of elements that it’s iterating over. You should use filter instead.

const myArr = ['123456', '234567'];

// `filter` accepts a string
function filter(str) {

  // Return a new filtered array that
  // doesn't contain that string
  return myArr.filter(el => {
    return el !== str;
  });

}

console.log(filter('123456'));