hack-sample.js

'use strict';
/*
 * Complete the 'strokesRequired' function below.
 *
 * The function is expected to return an INTEGER.
 * The function accepts STRING_ARRAY picture as parameter.
 */

function strokesRequired(picture) {
    // Write your code here 
    return 5;

}

function main() {
    let picture = `
aaaba
aaaba
aaacb`.split("\n").filter(r => !!r); 
    //let picture = `aaabaaaabaaaacb`.split("\n")
.filter(r => !!r).map(r => r.split(''));
    
    const result = strokesRequired(picture);

    console.log(result);
}

main();

https://gist.github.com/paul-ridgway/014d45aa38a19967c5302bd138e726b5 for an implementation