Understanding Javascript Quirks

Nov 2018

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18 Sun 11:00 AM – 11:45 AM IST

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Meetup 10
Sunday, November 18, 2018
11:00 AM to 1:00 PM
Venue to be updated.

This meetup is in Bangalore for women who write Javascript or who wish to learn Javascript. Come discuss your work, interests, and ideas!
To join, visit https://www.meetup.com/Girls-Who-Javascript/

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Girls Who Javascript

A meetup for women who write JavaScript (or who want to learn JavaScript). Come discuss your work, interests, and ideas! Look out this space for future meetups. Want to present some interesting idea or talk about informative web development concepts you learnt recently, submit your talk here https:… more

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Understanding Javascript Quirks

Submitted Oct 29, 2018

Technical level: Beginner

Understanding JS language features behind quirky behaviours

Outline

We have all come across the following quirky questions in quizzes or interviews:

var a = 20;
function foo() { 
   console.log(a)
   var a = 10;
   return function a() {}
}
// Outputs function a(){}

{} + [] = 0

[] + {} = "[object Object]"

{} + {} = NaN

({} + {}) = "[object Object][object Object]"

This talk is aimed at understanding the Javascript language features behind such behaviour such as hoisting, automatic type conversion for various operators, ToPrimitive internal algorithm to name a few.