I have an object list:
var myObj = {
obj1: {name: "bob", employed: true},
obj2: {name: "dave", employed: false},
obj3: {name: "james", employed: true},
}
What is the most efficient/elegant way to iterate through the object list and count how many objects are equal employed: true. Is there a short way to write this? I was thinking of implementing it like below:
const countEmployed = () => {
for (let key in myObj) {
if (myObj .hasOwnProperty(key)) {
}
}
}
You could use .reduce() on the Object.values() by using the boolean value of employed as a number to add to the total like so:
const myObj = {
obj1: {name: "bob", employed: true},
obj2: {name: "dave", employed: false},
obj3: {name: "james", employed: true},
};
const sum = Object.values(myObj).reduce((t, {employed}) => t+employed, 0);
console.log(sum);
Usually efficient isn't equal to elegant, however if you are looking for a short and elegant method, you could use Array#filter:
const myObj = {
obj1: {name: "bob", employed: true},
obj2: {name: "dave", employed: false},
obj3: {name: "james", employed: true},
};
const r = Object.values(myObj).filter(({ employed }) => employed).length;
console.log(r);However, the most efficient way would be probably to use a for in loop and just increase a counter if the employed value is truthy.
Technically you can use Object.values() to get all the property values first. Then you can use Array.filter() to get only the necessary ones.
Based on that I would do the following:
const myObj = {
obj1: {name: "bob", employed: true},
obj2: {name: "dave", employed: false},
obj3: {name: "james", employed: true},
}
const result = Object.values(myObj).filter(e => e.employed);
console.log('Count:', result.length);Read further here:
I hope this helps!