map in mdn code example

Example 1: array mdn map

let new_array = arr.map(function callback( currentValue[, index[, array]]) {
    // return element for new_array
}[, thisArg])

Example 2: mdn html map

<map name="primary">
  <area shape="rect" coords="0,0,75,75" href="left.html">

</map>
<img usemap="#primary" src="https://placehold.it/350x150" alt="350 x 150 pic">