Function for outputting the difference from an expected object to the terminal in javascript. Useful for testing. Not the cleanest code I have written.

object_differences.js

function recursiveDiff(expected, actual, parentNodeStr) {
  let isObject = expected !== null && typeof expected === 'object';
  isObject = isObject && (actual !== null && typeof actual === 'object');

  if (isObject) {
    // eslint-disable-next-line no-restricted-syntax
    for (const key in actual) {
      if (Object.prototype.hasOwnProperty.call(actual, key)) {
        const keyStr = `${parentNodeStr}.${key}`;
        // eslint-disable-next-line no-prototype-builtins
        if (actual.hasOwnProperty(key) && !expected.hasOwnProperty(key)) {
          console.log(`expected does not have key: ${keyStr}`);
          return;
        }
        const childIsObject = actual[key] !== null && typeof actual[key] === 'object';
        if (!childIsObject && actual[key] !== expected[key]) {
          console.log(`actual value for key ${keyStr} is: ${actual[key].toString()}`);
        }
        recursiveDiff(expected[key], actual[key], keyStr);
      }
    }
  } else if (Array.isArray(expected) && Array.isArray(actual)) {
    if (actual.length !== expected.length) {
      console.log('array are different lengths');
      return;
    }
    for (let i = 0; i < actual.length; i += 1) {
      if (actual[i] !== expected[i]) {
        console.log(`actual value for index ${i} is: ${actual[i]}`);
      } else {
        recursiveDiff(expected[i], actual[i], keyStr);
      }
    }
  }
}