Dustin Diaz’s Brain Teaser
Late last night Dustin Diaz posted a short brain teaser, there are lots of solutions already posted, but I didn’t see any with a similar approach to mine, so I thought I would also share:
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var arr = ['a', 'b', 'c', 'c', 'd', 'e', 'e',
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'e', 'e', 'e', 'f', 'e', 'f', 'e',
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'f', 'a', 'a', 'a', 'f', 'f', 'f'];
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var output = [];
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var tracker = [];
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arr.forEach(function(item, index, ar) {
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// check if the tracker array matches the current item
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if( tracker[0] === item ){
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// then check if we need to insert a marker
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if( tracker.length == 2 ){
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output[output.length] = '<span>';
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}
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}
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else {
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// if it is different check if we need to close the marker
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if(tracker.length > 2){
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output[output.length] = '</span>';
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}
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// now reset the tracking array
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tracker = [];
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}
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// add to the tracking and output arrays
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tracker[tracker.length] = item;
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output[output.length] = item;
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// close up, just incase we are open
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if( index == ar.length - 1 && tracker.length > 2){
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output[output.length] = '<span>';
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}
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});
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document.write(output.join(''));
and here is my live demo.
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