Returns the indexes within the string of the occurrences of the specified value

indexesof

function indexesOf(source, searchTerm) {
    var occurrences = [],
        index = 0;
    
    while (index = ~source.indexOf(searchTerm, index)) {
        index = ~index;
        occurrences.push(index);
        index++;
    }

    return occurrences;
}

console.log(indexesOf("das ist toll und ist super und ist auch cool", "a"));​