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9 lines
303 B
9 lines
303 B
"use strict"
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module.exports = function (parentLayer, childLayer) {
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if (!parentLayer.length && childLayer.length) return childLayer
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if (parentLayer.length && !childLayer.length) return parentLayer
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if (!parentLayer.length && !childLayer.length) return []
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return parentLayer.concat(childLayer)
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}
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