Retrieve property value selectively from array of objects in JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

Suppose, we have an array of objects like this −

const arr = [
   { id : "23", name : "Item 1", isActive : true},
   { id : "25", name : "Item 2", isActive : false},
   { id : "26", name : "Item 3", isActive : false},
   { id : "30", name : "Item 4", isActive : true},
   { id : "45", name : "Item 5", isActive : true}
];

We are required to write a JavaScript function that takes in one such object and return an array of the value of "id" property of all those objects that have true value for the "isActive" property.

Example

The code for this will be −

const arr = [
   { id : "23", name : "Item 1", isActive : true},
   { id : "25", name : "Item 2", isActive : false},
   { id : "26", name : "Item 3", isActive : false},
   { id : "30", name : "Item 4", isActive : true},
   { id : "45", name : "Item 5", isActive : true}
];
const findActive = (arr = []) => {
   const res = [];
   for(let i = 0; i < arr.length; i++){
      const obj = arr[i];
      const {
         id,
         isActive
      } = obj;
      if(isActive){
         res.push(id);
      }
   };
   return res;
};
console.log(findActive(arr));

Output

And the output in the console will be −

[ '23', '30', '45' ]
raja
Published on 23-Nov-2020 10:34:11
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