mathjs/src/function/relational/deepEqual.js

import { factory } from '../../utils/factory'

const name = 'deepEqual'
const dependencies = [
  'typed',
  'equal'
]

export const createDeepEqual = /* #__PURE__ */ factory(name, dependencies, ({ typed, equal }) => {
  /**
   * Test element wise whether two matrices are equal.
   * The function accepts both matrices and scalar values.
   *
   * Strings are compared by their numerical value.
   *
   * Syntax:
   *
   *    math.deepEqual(x, y)
   *
   * Examples:
   *
   *    math.deepEqual(2, 4)   // returns false
   *
   *    a = [2, 5, 1]
   *    b = [2, 7, 1]
   *
   *    math.deepEqual(a, b)   // returns false
   *    math.equal(a, b)       // returns [true, false, true]
   *
   * See also:
   *
   *    equal, unequal
   *
   * @param  {number | BigNumber | Fraction | Complex | Unit | Array | Matrix} x First matrix to compare
   * @param  {number | BigNumber | Fraction | Complex | Unit | Array | Matrix} y Second matrix to compare
   * @return {number | BigNumber | Fraction | Complex | Unit | Array | Matrix}
   *            Returns true when the input matrices have the same size and each of their elements is equal.
   */
  return typed(name, {
    'any, any': function (x, y) {
      return _deepEqual(x.valueOf(), y.valueOf())
    }
  })

  /**
   * Test whether two arrays have the same size and all elements are equal
   * @param {Array | *} x
   * @param {Array | *} y
   * @return {boolean} Returns true if both arrays are deep equal
   */
  function _deepEqual (x, y) {
    if (Array.isArray(x)) {
      if (Array.isArray(y)) {
        const len = x.length
        if (len !== y.length) {
          return false
        }

        for (let i = 0; i < len; i++) {
          if (!_deepEqual(x[i], y[i])) {
            return false
          }
        }

        return true
      } else {
        return false
      }
    } else {
      if (Array.isArray(y)) {
        return false
      } else {
        return equal(x, y)
      }
    }
  }
})