通过属性值查找对象属性的索引

Question

Using Javascript, I am trying to get the index of the object property who shares the value of a clicked button. I know the object's index to search, counter , but need to get the object property and it's index. For example, if I click the button with a value of "Poised", I need to return index of 'item2', which is 1.

 var questions = [{ 'item1': 'Alert', 'item2': 'Poised', 'item3': 'Ready', 'item4': 'Eager' }, { 'item1': 'Patient', 'item2': 'Diligent', 'item3': 'Forceful', 'item4': 'Prepared' } ] counter = 0 buttonValue = "Poised" console.log(questions[counter]) 

How can I do this?

Answer 1

As @obermillerk said, JavaScript objects do not have indexes. but you can use Object.values() to get the index from the array which basically includes the values of that object, by the order of its values.

 var questions = [{ 'item1': 'Alert', 'item2': 'Poised', 'item3': 'Ready', 'item4': 'Eager' }, { 'item1': 'Patient', 'item2': 'Diligent', 'item3': 'Forceful', 'item4': 'Prepared' } ]; var index; questions.forEach(obj => { var value = Object.values(obj).indexOf('Poised'); if(value !== -1) { index = value; } }) console.log(index);