rangoo94/easen-tools

/**
 * Deep-copy array.
 *
 * @param {array} initialValue
 * @returns {array}
 */
function deepCloneArray (initialValue) {
  const result = new Array(initialValue.length)

  for (let i = 0; i < initialValue.length; i++) {
    result[i] = deepCloneValue(initialValue[i])
  }

  return result
}

/**
 * Deep-clone regular object.
 *
 * @param {object} initialValue
 * @returns {object}
 */
function deepCloneObject (initialValue) {
  // Prepare new object
  const result = {}

  // Go through all keys inside
  for (const key in initialValue) {
    // Ignore not own keys
    if (!initialValue.hasOwnProperty(key)) {
      continue
    }

    // Get initial value
    const entryValue = initialValue[key]

    // Copy value
    result[key] = typeof entryValue === 'object' && entryValue
      ? JSON.parse(JSON.stringify(entryValue))
      : entryValue
  }

  return result
}

/**
 * Deep-copy any value.
 * Optimized for single level objects,
 * as it's probably most often happening case.
 *
 * @param {*} initialValue
 * @returns {*}
 */
function deepCloneValue (initialValue) {
  // Return back value which is not an object
  if (!initialValue || typeof initialValue !== 'object') {
    return initialValue
  }

  // Copy array or regular object
  return Array.isArray(initialValue)
    ? deepCloneArray(initialValue)
    : deepCloneObject(initialValue)
}

module.exports = deepCloneValue