why filter return array of objects javascript on false code example

Example 1: javascript array filter elements greater than

function isGreater(element, index, array) { 
   return (element >= 10); 
} 
          
let testElemets = [12, 5, 8, 130, 44].filter(isGreater); 
console.log("Test Value : " + testElemets );

Example 2: js filter items by index

let newArray = arr.filter(callback(element[, index, [array]])[, thisArg])