Retrieve records using any field in Javascript

Question

Retrieve records using any field in Javascript

Looking to work with an array of JavaScript objects, each containing three fields:

var people = [
  {first: "john", middle: "james", last: "doe"},
  {first: "jane", middle: "kate", last: "smith"},
  ...
  {first: "kathy", middle: "rose", last: "green"},
];

The goal is to query this array based on any field and receive the matching object as output. For example, being able to execute people.getByMiddle("kate") and retrieve

{first: "jane", middle: "kate", last: "smith"}

Wondering if there's a data structure that simplifies associating these elements or if it's better to create individual functions for each field to iterate over the data and search for matches. The primary concern is avoiding dependency on array ordering.

javascript arrays object format

Answer 1

Answer №1

To streamline your code, consider implementing a helper function:

/**
 * Look for a specific object within an array and return the first match.
 * @param {array} grouping - an array of objects.
 * @param {string} identifier 
 * @param {string} criteria
 * @returns {object|undefined} - the first matching object.
 */
function locateElement(grouping, identifier, criteria) {
   return grouping.filter(function(item) {
      return item[identifier] === criteria;
   })[0]; // extract the initial match
};

var individual = findWhere(peopleArray, 'middleName', 'Jane');

Answer 2

To streamline your code, consider implementing a helper function:

/**
 * Look for a specific object within an array and return the first match.
 * @param {array} grouping - an array of objects.
 * @param {string} identifier 
 * @param {string} criteria
 * @returns {object|undefined} - the first matching object.
 */
function locateElement(grouping, identifier, criteria) {
   return grouping.filter(function(item) {
      return item[identifier] === criteria;
   })[0]; // extract the initial match
};

var individual = findWhere(peopleArray, 'middleName', 'Jane');

Answer 3

Answer №2

function findObjectByProperty(arr, property, value) {
    arr.forEach(function(item) {
        if (item[property] === value) {
            return item;
        }
    });
}

To utilize this function:

var result = findObjectByProperty(users, 'lastName', 'Smith');

Answer 4

function findObjectByProperty(arr, property, value) {
    arr.forEach(function(item) {
        if (item[property] === value) {
            return item;
        }
    });
}

To utilize this function:

var result = findObjectByProperty(users, 'lastName', 'Smith');

Answer 5

Answer №3

Consider this potential resolution:

function locateIndividuals(dataArray, propertyKey, query) {
  return dataArray.filter(function(individual){
    return query.test(individual[propertyKey]);
  })
}

See it in action: http://example.com/jsbin123

Answer 6

Consider this potential resolution:

function locateIndividuals(dataArray, propertyKey, query) {
  return dataArray.filter(function(individual){
    return query.test(individual[propertyKey]);
  })
}

See it in action: http://example.com/jsbin123

Answer 7

Answer №4

Here is a solution that comes to mind:

let members = [
  {first: "Alex", middle: "Lee", last: "Johnson"},
  {first: "Emily", middle: "Grace", last: "Smith"},
  {first: "Michael", middle: "David", last: "Jones"},
];


members.getByMiddleName = function(name){ 
   let result = [];
   for(let i in this){
      let person = this[i];
      if(person.middle == name)
         result.push(person);
   }
   return result;
};

members.getByMiddleName("Grace");

Answer 8

Here is a solution that comes to mind:

let members = [
  {first: "Alex", middle: "Lee", last: "Johnson"},
  {first: "Emily", middle: "Grace", last: "Smith"},
  {first: "Michael", middle: "David", last: "Jones"},
];


members.getByMiddleName = function(name){ 
   let result = [];
   for(let i in this){
      let person = this[i];
      if(person.middle == name)
         result.push(person);
   }
   return result;
};

members.getByMiddleName("Grace");

Retrieve records using any field in Javascript

Answer №1

Answer №2

Answer №3

Answer №4

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