@jrc03c/js-math-tools/src/is-nested.test.mjs

some math tools for JS

import { DataFrame, Series } from "./dataframe/index.mjs"
import { expect, test } from "@jrc03c/fake-jest"
import { forEach } from "./for-each.mjs"
import { isNested } from "./is-nested.mjs"
import { normal } from "./normal.mjs"

test("tests that nested arrays can be identified correctly", () => {
  expect(isNested(normal(100))).toBe(false)
  expect(isNested(normal([10, 10]))).toBe(true)
  expect(isNested(normal([2, 3, 4, 5]))).toBe(true)
  expect(isNested(new Series(normal(100)))).toBe(false)
  expect(isNested(new DataFrame(normal([10, 10])))).toBe(true)

  const wrongs = [
    0,
    1,
    2.3,
    -2.3,
    Infinity,
    -Infinity,
    NaN,
    "foo",
    true,
    false,
    null,
    undefined,
    Symbol.for("Hello, world!"),
    x => x,
    function (x) {
      return x
    },
    { hello: "world" },
  ]

  forEach(wrongs, item => {
    expect(() => isNested(item)).toThrow()
  })
})