如何循环遍历 object 并获取每个元素的索引并将其存储在数组中？

Question

Here is what I have tried so far but I am only getting 1 value in return.

Object.keys(yelpResults).map((key) => {
  return setRestaurantIndexes(restaurantIndexes.concat(key));
});

Answer 1

you can refer this example if it helps. Map function can be executed on array, so first we need to convert object into array and then execute operation on it.

const details={
  name:'John',
  lName:'lee',
  country:'US'
}

const getIndex = Object.keys(details).map((item , i)=>{
  return i;  
});

console.log(getIndex);

Answer 2

The function Object.keys alone do the trick, it returns an array with the names of the properties and methods of an object.

const data = {
  name: 'John Doe',
  age: 50,
  country: 'NZ'
}

const propertyNames = Object.keys(data)

console.log(propertyNames);
// prints: ['name', 'age', 'country']

Answer 3

• First make your object.

   const result = ["Apple", "Orange", "Plum"];

• Then declare an array where you will save your index values

  let newArray = []

• Then loop through the object created at step 1.

   //loop the results for(var i=0, l=result.length; i < l; i++){ //push the object's index to the array newArray.push(i); }

• Console Log your new array with index values saved in it.

   console.log(newArray);