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GH-44246: [JS] encourage more efficient APIs in the examples #44292

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GH-44246: [JS] encourage more efficient APIs in the examples #44292

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16 changes: 15 additions & 1 deletion js/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,7 @@ import { tableFromIPC } from 'apache-arrow';
const arrow = readFileSync('simple.arrow');
const table = tableFromIPC(arrow);

console.table(table.toArray());
console.table([...table]);

/*
foo, bar, baz
Expand All @@ -64,6 +64,20 @@ null, null, null
*/
```

The most efficient way to work with an Arrow `Table` is to access the column Vectors (which you can get with `getChild` and `getChildAt`).

```js
table.getChildAt(0).get(0); // 1
```

If you need to access the rows, you can iterate over the table and access a row proxy.

```js
for (const row of table) {
console.log(row);
}
```

### Create a Table when the Arrow file is split across buffers

```js
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