- Interview Tips and Tricks – Its All Abоut Marketing the Skills and Talents
- Digging into the ways to delete multiple records in codeigniter
- How Does A MongoDB Developer Certification Benefit Your Career
- What Is The Best Programming Language For The Mobile Application Development?
- Advanced css interview questions
Underscore.js Interview Questions
2. Explain Collection Functions in Underscore.js.list some under collection functions in Underscore.js?
Collection Functions are functions that work on arrays, objects, and array-like objects such as arguments, NodeList and similar.Below is the list of some collection functions in Underscore.js.
Function name Prototype each : _.each(list, iteratee, [context]) map : _.map(list, iteratee, [context]) find : _.find(list, predicate, [context]) filter : _.filter(list, predicate, [context]) reject : _.reject(list, predicate, [context])
Readmore from http://underscorejs.org/#collections
_.contains method is used to check an element in array exists or not in Underscore.js.
Prototype : _.contains(list, value, [fromIndex])
It will take three arguments first two are required and third is optional. The internally _.contains method uses indexOf if the supposed list is a type of array.
var arrayList=['aaa', 'bbb', 'cfp', 'ddd']; var needle1="cfp"; var needle2="abc"; _.contains(arrayList, needle1); // outputs true _.contains(arrayList, needle2); // outputs false
Related Interview Questions
Node JS Interview Questions with Express
Ajax Interview Questions
Aurelia Interview Questions
Backbone js Interview Questions
D3.js interview questions
Ecmascript 2017 Interview Questions
Emberjs Interview questions
ES6 Interview Questions
Ext js Interview Questions
Grunt js Interview questions
Gulp Js interview questions
Handlebars js interview questions
JQuery Interview Questions
JSON Interview Questions
Knockout js Interview Questions
Koa Js Interview questions
Less.js interview questions
Marionette js interview questions
Phantomjs Interview Questions
Subscribe Our NewsLetter
Never Miss an Articles from us.
- Most Common Interview Questions
- Python Flask Interview Questions
- NoSQL interview questions
- JQuery Interview Questions
- C programming interview questions
- AngularJS Interview Questions
- Node JS Interview Questions with Express
- Core Java interview questions
- HTML Interview Questions
- Laravel interview questions
- Wordpress Interview Questions
- PHP Interview Questions