Function serializeD

test/compute-engine/explain.test.ts:659–669

(
  latex: string,
  options?: { variable?: string }
)

): { initial: string; result: string; steps: string[] } {
  const ex = ce.parse(latex).explain('D', options);
  return {
    initial: ex.initial.toString(),
    result: ex.result.toString(),
    steps: ex.steps.map((s) => `${s.id}: ${s.value.toString()}`),
  };
}

describe('explain: golden D explanations', () => {
  test('x sin(x): product rule + known derivative', () => {
    const ex = ce.parse('x \\sin x').explain('D');
    expect(ex.steps.some((s) => s.id === 'derivative.product-rule')).toBe(true);
    expect(ex.steps.some((s) => s.id === 'derivative.known-derivative')).toBe(
      true
    );