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47 lines
1.3 KiB
JavaScript
47 lines
1.3 KiB
JavaScript
'use strict'
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var constants = require('../constant/constants.js')
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var splice = require('../constant/splice.js')
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// `Array#splice` takes all items to be inserted as individual argument which
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// causes a stack overflow in V8 when trying to insert 100k items for instance.
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function chunkedSplice(list, start, remove, items) {
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var end = list.length
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var chunkStart = 0
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var parameters
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// Make start between zero and `end` (included).
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if (start < 0) {
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start = -start > end ? 0 : end + start
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} else {
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start = start > end ? end : start
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}
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remove = remove > 0 ? remove : 0
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// No need to chunk the items if there’s only a couple (10k) items.
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if (items.length < constants.v8MaxSafeChunkSize) {
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parameters = Array.from(items)
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parameters.unshift(start, remove)
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splice.apply(list, parameters)
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} else {
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// Delete `remove` items starting from `start`
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if (remove) splice.apply(list, [start, remove])
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// Insert the items in chunks to not cause stack overflows.
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while (chunkStart < items.length) {
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parameters = items.slice(
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chunkStart,
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chunkStart + constants.v8MaxSafeChunkSize
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)
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parameters.unshift(start, 0)
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splice.apply(list, parameters)
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chunkStart += constants.v8MaxSafeChunkSize
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start += constants.v8MaxSafeChunkSize
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}
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}
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}
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module.exports = chunkedSplice
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