What would I code if I want to extract Alex's age from this array of objects?-CodePudding

var students = [ {
    name:"Mary",
    age: 10
  }, 
 
  {
    name:"Barbara",
    age:11
  }, 
 
  {
    name:"David",
    age:12
  },
  
   {
    name:"Alex",
    age:11
  } ];

CodePudding user response：

You can use for..of syntax for iterating over the array elements. If the element has .name that you need, extract the .age:

function getAge(arr, name) {
    for (let s of students) {
        if (s.name == name) return s.age
    }
}

Then you can use this function like this:

alert(getAge(students, 'Alex'));

CodePudding user response：

Use Array.find to get the item in the array whose name property is "Alex", then get the item's age property:

var students=[{name:"Mary",age:10},{name:"Barbara",age:11},{name:"David",age:12},{name:"Alex",age:11}];

let res = students.find(e => e.name == "Alex").age
console.log(res)