| 1 | ;
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| 2 |
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| 3 | // converts a changing absolute value into a value relative to the previous value
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| 4 | module.exports = function() {
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| 5 | var last = -1;
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| 6 | return function(current) {
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| 7 | if (last === -1) {
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| 8 | last = current;
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| 9 | }
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| 10 | var delta = current - last;
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| 11 | last = current;
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| 12 | return delta;
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| 13 | };
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| 14 | };
|