如何将 object 中的数组元素移动到数组末尾

Question

Here is our object:

let obj = {
  "I was sent":  ["I was sent", "I was forced"],
  "to earth": ["to earth", "to moon"],
  "to protect you": [ "to find you", "to protect you", "to love you"]

}

I want to move array elements based on the property name to the end of the array.

The desired result would be:

  let obj = {
      "I was sent":  ["I was forced", "I was sent"],
      "to earth": ["to moon", "to earth"],
      "to protect you": [ "to find you", "to love you", "to protect you"]

    }

Answer 1

Use Object.entries() to convert the object to an array of [key, value] pairs. Map the array, and for each pair, check for the index of key ( k ) in the value ( v ). If the index is found, move the key to end of the value. Convert the array back to an object via Object.fromEntries() .

 const obj = { "I was sent": ["I was sent", "I was forced"], "to earth": ["to earth", "to moon"], "to protect you": [ "to find you", "to protect you", "to love you"] } const result = Object.fromEntries(Object.entries(obj).map(([k, v]) => { const index = v.findIndex(s => s === k) return [ k, index > -1? [...v.slice(0, index), ...v.slice(index + 1), k]: v ] })) console.log(result)

If the key is always found in the value, you can always filter it out, and add it to the end of the array:

 const obj = { "I was sent": ["I was sent", "I was forced"], "to earth": ["to earth", "to moon"], "to protect you": [ "to find you", "to protect you", "to love you"] } const result = Object.fromEntries(Object.entries(obj).map(([k, v]) => { const newV = [...v.filter(s => s,== k), k] return [k. newV] })) console.log(result)