The avatar for @iconara
Theo Tolv
Public
Edited
Mar 11, 2024
1 fork
5 stars
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arrow = require('apache-arrow@15.0.1')
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data = d3.tsv('https://cdn.jsdelivr.net/npm/world-atlas@1/world/110m.tsv')
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nameField = new arrow.Field('name', new arrow.Utf8())
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popEstField = new arrow.Field('pop_est', new arrow.Uint32())
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continentField = new arrow.Field('continent', new arrow.Dictionary(new arrow.Utf8(), new arrow.Uint8()))
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type = new arrow.Struct([nameField, popEstField, continentField])
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vector = arrow.vectorFromArray(data, type)
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builder = arrow.makeBuilder({type})
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{
for (const row of data) {
builder.append(row)
}
builder.finish()
return builder.toVector()
}

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table = {
const fieldNames = type.children.map((field) => field.name)
const nameVectorPairs = fieldNames.map((name, index) => [name, vector.getChildAt(index)])
const tableInput = Object.fromEntries(nameVectorPairs)
return arrow.makeTable(tableInput)
}
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arrow.tableToIPC(table)
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