Question

Starting from an array of arbitrary values I would like to be able to extract all sequences of a given value.
So if I started with this

[1,0,1,1,1,1,0,0]

and searched for 1. I would like to get back

[[1],[1,1,1,1]]

I have seen an implementation in AS though not clear enough for me to translate over: finding sequences in AS3 array

Answer 1

I wrote one from scratch with code comments:

function makeSequence(input, val) {
    var output = [], current = [];

    for (var i = 0; i < input.length; i++) {
        if (input[i] === val) {
            // if we have a matching value, add it to
            // the current match
            current.push(val);
        } else if (current.length) {
            // no match on current value, write out
            // any previous match
            output.push(current);
            current = [];
        }
    }
    // when done, make sure to add the last match
    if (current.length) {
        output.push(current);
    }
    return(output);
}

Working demo here: http://jsfiddle.net/jfriend00/YvsET/