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Java built in objects doc

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Mar 1, 2020

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Section 1

(29 cards)

Java built in objects doc

Front

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects

Back

What is string interpolation?

Front

Using template literals to imbed variables into strings

Back

Undefined

Front

This data type is denoted by the keyword undefined (without quotes). It also represents the absence of a value though it has a different use than null.

Back

Operator

Front

a character that performs a task in our code

Back

few things you can do with variables:

Front

1. Create a variable with a descriptive name. 2. Store or update information stored in a variable. 3. Reference or "get" information stored in a variable.

Back

Number

Front

Any number, including numbers with decimals: 4, 8, 1516, 23.42.

Back

Null

Front

This data type represents the intentional absence of a value, and is represented by the keyword null (without quotes).

Back

dot operator

Front

. ex: 'How long is this'.length

Back

placeholder

Front

${variableName}

Back

Variables that have not been initialized store the primitive data type ________.

Front

undefined

Back

Number doc

Front

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number

Back

How to call a method

Front

by appending the object or instance with a period, the method name, and parentheses

Back

Arithmetic Operators

Front

Add: + Subtract: - Multiply: * Divide: / Remainder: % (modulo)

Back

Boolean

Front

This data type only has two possible values— either true or false (without quotes). It's helpful to think of booleans as on and off switches or as the answers to a "yes" or "no" question.

Back

String

Front

Any grouping of characters on your keyboard (letters, numbers, spaces, symbols, etc.) surrounded by single quotes: ' ... ' or double quotes " ... ". Though we prefer single quotes. Some people like to think of string as a fancy word for text.

Back

Math doc

Front

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math

Back

let

Front

stores any value in a variable; can be reassigned

Back

Object

Front

Collections of related data.

Back

variable

Front

a container for a value

Back

const

Front

stores any value in a variable; can't be reassigned

Back

typeof

Front

returns the type of the variable

Back

Methods

Front

Performs an action

Back

7 fundamental data types

Front

strings, numbers, booleans, null, undefined, symbol, and object

Back

how to print into the console

Front

console.log

Back

Symbol

Front

A newer feature to the language, symbols are unique identifiers, useful in more complex coding. No need to worry about these for now.

Back

Javascript string doc

Front

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/prototype

Back

decrement operator

Front

--; decreases the value of a variable by 1

Back

increment operator

Front

++; increases the value of the variable by 1

Back

template literal

Front

wrapped by backticks `; used to insert or interpolate variables into strings by using a placeholder

Back