xatto/src/deepSet.ts

xatto is View Layer Library based on Function and Context using VirtualDOM. This is developed by forking from jorgebucaran/superfine.

import { OBJECT } from './consts/typeNames'

/**
 * Set an object item to a given value using separator notation.
 *
 * @param  target any
 * @param  key strig
 * @param  value any
 * @param  separator string
 * @return Boolean
 */
export function deepSet (
  target: any,
  key: string,
  value: any,
  separator: string = '.'
) {
  while (true) {
    if (OBJECT !== typeof target) {
      return false
    }

    const idx = key.indexOf(separator)
    if (idx < 0) {
      target[key] = value
      return true
    }

    const current = key.slice(0, idx)
    const nexts = key.slice(idx + 1)

    if (null == target[current]) {
      const next = nexts.split(separator, 1)[0]
      target[current] = next === `${parseInt(next, 10)}` ? [] : {}
    }

    target = target[current]
    key = nexts
  }
}