Set an object's nested value

setNestedValue.js

/*
  Usage: setNestedValue(<object>, <array>, <value>)
  
  const object = {
    key1: {
      key11: 'nested-value'
    }
  }
  
  const newObject = setNestedValue(object, ['key1', 'key12'], 'another-nested-value')
  
  console.log(newObject)
  
  > {
    key1: {
      key11: 'nested-value',
      key12: 'another-nested-value'
    }
  }
*/

const setNestedValue = (object, pathArr, value) => {
  if (typeof object === 'object') {
    const obj = JSON.parse(JSON.stringify(object))
    if (Array.isArray(pathArr)) {
      const path = pathArr.slice(0)
      const firstKey = path.shift()
      if (!path.length) {
        obj[firstKey] = value
      } else {
        if (typeof obj[firstKey] === 'undefined') {
          obj[firstKey] = {}
        }
        obj[firstKey] = setNestedValue(obj[firstKey], path, value)
      }
    }
    return obj
  }
  return object
}