JavaScript - 如果 object 属性具有特定值，则创建一个 object 键数组

Question

Given an object with children objects:

   {
        a: {
           name  : 'John'
         , isRequired : true
      }
      , b: {
           name  : 'Jack'
         , isRequired : false
      }
      , c: {
           name  : 'Mary'
         , isRequired : true
      }
      , d: {
           name  : 'Victor'
         , isRequired : false
      }
   };

Generate an array with the keys of the objects where isRequired is true :

['a', 'c']

One way to do this is:

 const data = { a: { name: 'John', isRequired: true }, b: { name: 'Jack', isRequired: false }, c: { name: 'Mary', isRequired: true }, d: { name: 'Victor', isRequired: false } }; let required = []; for (const [key, val] of Object.entries(data)) { if (val.isRequired) { required.push(key); } } console.log(required);

Any better alternative?

Answer 1

I would use filter

 const data = { a: { name: 'John', isRequired: true }, b: { name: 'Jack', isRequired: false }, c: { name: 'Mary', isRequired: true }, d: { name: 'Victor', isRequired: false } }; let required = Object.keys(data).filter(key => data[key].isRequired) console.log(required);