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memorize.ai (lvl 286)

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List all of the possible states of a promise

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Mar 1, 2020

Cards (22)

Section 1

(22 cards)

List all of the possible states of a promise

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fulfilled, rejected, or pending

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command line arguments

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The process.argv property can be used to get all the ___.

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foods.yummies.candy

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The file foods.js contains the code shown below. How would snickers be referenced in another file that had imported foods.js into the variable foods? var yummies = { candy: "snickers", soda: "pepsi", chips: "lays" } module.exports = { yummies: yummies }

Back

Javascript Object Prototype

Front

All JavaScript objects inherit properties and methods from a prototype.

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How many possible states can a promise be in?

Front

3

Back

What is a Javascript Primitive data type?

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A primitive data type is data that has a primitive value.

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['i', 'love', 'coding']

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The contents of the file data.txt are i,love,coding. What will be the output of the code below? var fs = require("fs"); fs.readFile("data.txt", "utf8", function(err, data) { var output = data.split(","); console.log(output); });

Back

Every object has a ...

Front

prototype (each prototype has it's own prototype, and on to infinite)

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What is a promise?

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A promise is an object that may produce a single value some time in the future: either a resolved value, or a reason that it's not resolved (e.g., a network error occurred)

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a number

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The parseFloat and parseInt JavaScript functions can be used to parse an argument into ___.

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How many Javascript primitive data types are there?

Front

5: string number boolean null undefined

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What is a factory function?

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Back

What is a Javascript Primitive value?

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A primitive value is a value that has no properties or methods.

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How would you store something for a long time?

Front

Write it to a file (fs.write)

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require

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When writing JavaScript files that use Node, we can bring in code exported from another file using the ___ keyword.

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the package.json file

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Any NPM packages that an application is dependent on should be listed in ___.

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Node is also

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a run-time environment that runs Javascript OUTSIDE of the browser

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Finally, Node allows developers...

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to build web-servers, stand-alone desktop apps, phone apps (check out Electron)

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What is in object in Javascript?

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In JavaScript, almost "everything" is an object. Booleans can be objects (if defined with the new keyword) Numbers can be objects (if defined with the new keyword) Strings can be objects (if defined with the new keyword) Dates are always objects Maths are always objects Regular expressions are always objects Arrays are always objects Functions are always objects Objects are always objects All JavaScript values, except primitives, are objects.

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What 5 thins does 'new' operator do?

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1) It creates a new object. The type of this object is simply object. 2) It sets this new object's internal, inaccessible, [[prototype]] (i.e. proto) property to be the constructor function's external, accessible, prototype object (every function object automatically has a prototype property). 3) It makes the this variable point to the newly created object. 4) It executes the constructor function, using the newly created object whenever this is mentioned. 5) It returns the newly created object, unless the constructor function returns a non-null object reference. In this case, that object reference is returned instead.

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Node

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Runs javascript; terminal; server-size

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asynchronous

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Node uses ___ threading which allows the server to handle all requests using a single thread through event-based callbacks.

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