I recently started learning more and more about Javascript and have found some practice questions/scenarios and I sometimes google stuff on how to approach it or learn new commands, parameters, etc through the searches

I'm currently working on finding all instances of "waldo" within a string that I've set to lowercase. During my searches I found this and kind of want to rubberduck to see if my understanding is correct.

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'a' is set as an empty array while the index value is set to -1 so it looks at the end of the string.

while the index value is equal to the index value of the substring location, it will add 1 to the index, as long as the index position is >=0.

It will push the accepted positions into 'a' and then return a'

function locations(substring,string){   var a=[],i=-1;   while((i=string.indexOf(substring,i 1)) >= 0) a.push(i);   return a; }  console.log(locations("s","scissors")); //-> [0, 3, 4, 7]