Retrieve values from an array of objects using their corresponding keys

Question

Retrieve values from an array of objects using their corresponding keys

I have an array populated with various objects containing different key-value pairs. I need to extract specific values from the array and determine if a certain value is present or not.

function groupByName (contract) {
 const { age } = contract;

 const groups = [
  {name: 'John', age: 30},
  {name: 'Jack', age: 33},
  {name: 'Tom', age: 40}
  ...
 ];
 ...
}

Currently, in order to compare the age in the groups array, I rely on loop functions to iterate through each object one by one.

groups.forEach(g => {
 if (g.age === age) {
  ...
 } else {
  ...
 }
});

However, I find this method cumbersome and am seeking a simpler and more efficient solution. Any suggestions would be greatly appreciated!

javascript

Answer 1

Answer №1

Utilizing the filter method allows you to split a list into two separate sublists.

Here is an example:

const people = [
  {name: 'Alice', age: 25},
  {name: 'Bob', age: 30},
  {name: 'Charlie', age: 35}
]

const above30 = age => people.filter(p => p.age >= age)
const below30 = age => people.filter(p => p.age < age)

const over30 = above30(30)

const under30 = below30(30)

over30.forEach(p => {
  console.log('Dealing with people aged 30 and above:', p)
})

under30.forEach(p => {
  console.log('Handling people below the age of 30:', p)
})

Answer 2

Utilizing the filter method allows you to split a list into two separate sublists.

Here is an example:

const people = [
  {name: 'Alice', age: 25},
  {name: 'Bob', age: 30},
  {name: 'Charlie', age: 35}
]

const above30 = age => people.filter(p => p.age >= age)
const below30 = age => people.filter(p => p.age < age)

const over30 = above30(30)

const under30 = below30(30)

over30.forEach(p => {
  console.log('Dealing with people aged 30 and above:', p)
})

under30.forEach(p => {
  console.log('Handling people below the age of 30:', p)
})

Answer 3

Answer №2

Perhaps you might find this function helpful

groups.some(person => person.age === age)//returns true if an object meets the criteria, otherwise false

Alternatively, check out this resource about Array.some on MDN

On a side note, if you need to run an if/else statement in every iteration, consider using forEach instead

Answer 4

Perhaps you might find this function helpful

groups.some(person => person.age === age)//returns true if an object meets the criteria, otherwise false

Alternatively, check out this resource about Array.some on MDN

On a side note, if you need to run an if/else statement in every iteration, consider using forEach instead

Retrieve values from an array of objects using their corresponding keys

Answer №1

Answer №2

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