type 'NodeListOf<HTMLLIElement>' is not assignable to type 'Element[]'

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let li: Element[] = document.getElementsByTagName('span');

I get the type conversion error, how to store the values in 'Element[ ]' ??

The object returned from document.getElementsByTagName('span') is not compatible with an array object. You need to declare it as following:

let li: NodeListOf<HTMLElement> = document.getElementsByTagName('span');

If you really need this to be an array object you can use:

let li: NodeListOf<HTMLElement> = document.getElementsByTagName('span');
let liArray: Element[] = Array.prototype.slice.call(li);

TypingClub: Learn Touch Typing Free, Type definition, a number of things or persons sharing a particular characteristic, or set of characteristics, that causes them to be regarded as a group, more or  type, kind, sort, nature, description, character mean a number of individuals thought of as a group because of a common quality or qualities. type may suggest strong and clearly marked similarity throughout the items included so that each is typical of the group. one of three basic body types kind may suggest natural grouping.

The problem here is that getElementsByTagName returns an array-like object, not an actual array. You need to coerce it to one first using the spread operator (or [].slice.call(...) for ES5):

let li: HTMLElement[] = [...document.getElementsByTagName('span')]

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Try creating the implicit form of the variable first, then transfer this definition explicitly:

let li = document.getElementsByTagName('span');//Hover IDE


let li: NodeListOf<HTMLSpanElement>= document.getElementsByTagName('span');


let arr: Element[]
    for (let i in li) 
      arr.push(li[i] as Element)

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  • I assume it's an array, so you use push()?
  • can you suggest alternate method?? @Mr.Alien