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JavaScript Data Types

JavaScript Data Types

memorize.aimemorize.ai (lvl 286)
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15 cards
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Section 1

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What is an Object?

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1 / 15

TypeScript
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Last updated

6 years ago

Date created

Mar 1, 2020

Cards (15)

Section 1

(15 cards)

What is an Object?

Front

JavaScript objects are written with curly braces. Object properties are written as name:value pairs, separated by commas.

Back

True or false: JavaScript evaluates expressions from right to left?

Front

False. It evaluates them from left to right.

Back

What is Complex Data?

Front

The typeof operator can return one of two complex types: function object The typeof operator returns "object" for arrays because in JavaScript arrays are objects.

Back

What does the typeof operator do?

Front

You can use the JavaScript typeof operator to find the type of a JavaScript variable. The typeof operator returns the type of a variable or an expression:

Back

What is a series of characters like "John Doe"

Front

A string.

Back

What does a "object" data type look like?

Front

var x = {firstName:"John", lastName:"Doe"};

Back

What is an Array?

Front

allows you to store and work with multiple values of same data type. They are written with square brackets. Array indexes are zero-based, which means the first item is [0], second is [1], and so on.

Back

What is Primitive Data?

Front

A primitive data value is a single simple data value with no additional properties and methods. The typeof operator can return one of these primitive types: string number boolean null undefined

Back

What does a "string" data type look like?

Front

var lastName = "Johnson";

Back

What does Null mean in JavaScript?

Front

null is "nothing". It is supposed to be something that doesn't exist. Unfortunately, in JavaScript, the data type of null is an object. You can empty an object by setting it to null:

Back

How are JavaScript types dynamic?

Front

They are dynamic because the same variable can be used to hold different data types.

Back

What are data types?

Front

numbers, strings, objects and more.

Back

What does a "number" data type look like?

Front

var length = 16;

Back

True or false: Numbers cant be written with decimal places.

Front

False. Numbers can be written with, or without decimals.

Back

What is a Boolean?

Front

They can only have two values: true or false and are often used in conditional testing.

Back