FAQ: Introduction to JavaScript - Built-in Objects


#1

This community-built FAQ covers the “Built-in Objects” exercise from the lesson "Introduction to JavaScript ".

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This exercise can be found in the following Codecademy content:

Web Development

Introduction To JavaScript

FAQs on the exercise Built-in Objects

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#2

Why is “console.log(Number.isInteger(2017));” used for determining whether 2017 is a whole number, and not "console.log(2017.isInteger()) ?


#3

I think its because your calling the function or whatever, or what you want to do with it, first. Its kinda like how yoda talks. “to the garbage, take this item” or something like that. so instead of is 2017 an integer, its “is an integer, 2017?”…I think


#4

When you’re using a method on an object (in this case the isInteger method on the number object)- Do I always have to refer to the general Object first? (Here: Number.) As in, does it apply to methods on other objects? Also I’m wondering why this doesn’t work (without “Number”): console.log(isInteger(2017)) …?