Pinafore-Web-Client-Frontend/routes/_utils/arrays.js

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// Merge two arrays, assuming both input arrays have the same order
// and items are comparable
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export function mergeArrays (leftArray, rightArray) {
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let leftIndex = 0
let rightIndex = 0
let merged = []
while (leftIndex < leftArray.length || rightIndex < rightArray.length) {
if (leftIndex === leftArray.length) {
merged.push(rightArray[rightIndex])
rightIndex++
continue
}
if (rightIndex === rightArray.length) {
merged.push(leftArray[leftIndex])
leftIndex++
continue
}
let left = leftArray[leftIndex]
let right = rightArray[rightIndex]
if (right === left) {
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merged.push(left)
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rightIndex++
leftIndex++
} else if (parseInt(right, 10) > parseInt(left, 10)) {
merged.push(right)
rightIndex++
} else {
merged.push(left)
leftIndex++
}
}
return merged
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}