How to use the size function from underscore

Find comprehensive JavaScript underscore.size code examples handpicked from public code repositorys.

underscore.size is a function that returns the number of elements in a collection (e.g. an array or an object) in Underscore.js.

index.js

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    });
  },

  // Update the `.length` attribute on this container
  _updateLength: function(){
    this.length = _.size(this._elements);
  }
});

// Borrowing this code from Backbone.Collection:

index.js

GitHub: christinadivya/bot-one-one

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//  create Broadcast group
socket.on('create-broadcast', function (data, callback) {

  let roomUsersCount = _.size((data.users));
  if (roomUsersCount <= 100) {
    ChatroomController.createbroadcast(data, function (err, chatGroupResponse) {
      console.log(chatGroupResponse.HCHAT_ROOM_Chat_Room_ID)

How does underscore.size work?

underscore.size works by accepting a collection (e.g. an array or an object) as its argument and returning the number of elements in the collection. Internally, underscore.size checks the type of the collection and uses a for...in loop to iterate through its elements if it is an object, or the length property if it is an array or a string, and increments a counter for each element found. It returns the final count when iteration is complete. Here's an example implementation of underscore.size: javascript Copy code {{{{{{{ _.size = function(collection) { var size = 0; if (isArrayLike(collection)) { for (var i = 0, length = collection.length; i < length; i++) { size++; } } else { for (var key in collection) { if (has(collection, key)) { size++; } } } return size; }; In this implementation, isArrayLike is a helper function that checks if a value is array-like, and has is a helper function that checks if an object has a given property. The implementation first initializes the size counter to 0. If the collection argument is array-like, it uses a for loop to iterate through the elements of the collection and increments size for each element found. Otherwise, it uses a for...in loop to iterate through the keys of the object and increments size for each key that the object has. Finally, the implementation returns the final count in size.

AdminController.js

GitHub: overleaf/overleaf

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    x => x.length
  )
)
metrics.gauge(
  'open_connections.http',
  _.size(__guard__(require('http').globalAgent, x3 => x3.sockets))
)
metrics.gauge(
  'open_connections.https',
  _.size(__guard__(require('https').globalAgent, x4 => x4.sockets))

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+ 13 other calls in file

signup.js

GitHub: Shaikh-Shayan/Medicare

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var a;
const result12 = User.find({ userName: req.body.userName }).then(
  (result2) => {
    // console.log(result2)
    same = result2;
    a = us.size(same);
    // console.log("this is same"+ a)

    if (a == 0) {
      const em = validator.validate(req.body.email); // true

+ 2 other calls in file

Ai Example

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const _ = require("underscore");

const arr = [1, 2, 3, 4, 5];
const obj = { a: 1, b: 2, c: 3 };

console.log(_.size(arr)); // Output: 5
console.log(_.size(obj)); // Output: 3

In this example, we use underscore.size to get the number of elements in an array arr and an object obj. The function returns the number of elements in the array and the number of keys in the object, respectively.

aldeed_collection2-core.js

GitHub: NadeemBeg/shopSkip-liquor_app

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{ // Escaping one level
  matchJSONValue: function (obj) {
    return _.has(obj, '$escape') && _.size(obj) === 1;
  },
  matchObject: function (obj) {
    if (_.isEmpty(obj) || _.size(obj) > 2) {
      return false;
    }
    return _.any(builtinConverters, function (converter) {
      return converter.matchJSONValue(obj);

+ 3 other calls in file

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