Pick keys from object which contains specific string as substring in Javascript

Question

I am having an array like:

var arr = ["hello","world"] 
// This array can contain any number of strings

Object like this:

var obj_arr = {
  "abc-hello-1": 20,
  "def-world-2": 30,
  "lmn-lo-3": 4
}

I want to have an object which contains only those keys, which contains above array values as substrings. For eg:

Result will look like :

var result = {
  "abc-hello-1": 20,
  "def-world-2": 30,
}

I want to do something like this (using lodash) :

var to_be_ensembled = _.pickBy(timestampObj, function(value, key) {
  return _.includes(key, "hello");
  // here instead of "hello" array should be there
});

Answer 1

With lodash you can use _.some() to iterate the strings arrays, and to check if the key includes any of the strings.

 const arr = ["hello", "world"] const timestampObj = { "abc-hello-1": 20, "def-world-2": 30, "lmn-lo-3": 4 } const to_be_ensembled = _.pickBy(timestampObj, (value, key) => _.some(arr, str => _.includes(key, str)) ); console.log(to_be_ensembled);

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Answer 2

Using only javascript you can acheive this using array forEach & Object.Keys function

 var arr = ["hello", "world"] var obj_arr = { "abc-hello-1": 20, "def-world-2": 30, "lmn-lo-3": 4 } var resultObj = {}; // get all the keys from the object var getAllKeys = Object.keys(obj_arr); arr.forEach(function(item) { // looping through first object getAllKeys.forEach(function(keyName) { // using index of to check if the object key name have a matched string if (keyName.indexOf(item) !== -1) { resultObj[keyName] = obj_arr[keyName]; } }) }) console.log(resultObj)

Answer 3

Try this code

var result = _.map(arr, function(s){
  return _.pickBy(timestampObj, function(v, k){
    return new RegExp(s,"gi").test(k)
  })
})