JavaScript Data Types and Objects
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Questions and Answers

What is a symbol?

  • A unique thing that gets created every time it is referred to (correct)
  • A sequence of characters enclosed in quotes, apostrophes, or backticks
  • A collection of named properties and values
  • A description of a string
  • What type of object can contain properties and methods?

  • Strings
  • Symbols
  • Objects (correct)
  • Characters
  • What is the purpose of a prototype?

  • To search for properties
  • To unhook an object from all variables
  • To create a bunch of objects that look or behave similarly (correct)
  • To store values of objects
  • How can you access properties in JavaScript?

    <p>With square-bracket notation</p> Signup and view all the answers

    What is the range of values for an integer?

    <p>-2,147,483,648 to 2,147,483,647</p> Signup and view all the answers

    Which type of language is JavaScript?

    <p>Weakly typed</p> Signup and view all the answers

    Study Notes

    • In JavaScript, a string is a sequence of characters enclosed in quotes, apostrophes, or backticks.
    • Characters are just named symbols, and there can be more than one character with the same name.
    • Strings can be concatenated, joined, trimmed, split, and interpolated.
    • Internally, strings are not exactly strings of characters, but they feel like they are.
    • To understand strings, we have to go a bit deeper and ask: What is a character?
    • A JavaScript string is a sequence of code units, also known as char codes.
    • A symbol is a unique thing that gets created every time it is created.
    • A string can have a description, but it is not good for anything else other than printing.
    • Objects are a special type of string that can contain properties and methods.
    • An object is a collection of named properties and values.
    • You can access properties with square-bracket notation.
    • Values of non-objects are “stored directly” while the values of objects are the pointers, not the objects themselves.
    • Every object in JavaScript has a prototype.
    • When looking up properties, the prototype chain is searched.
    • Prototypes are very useful when creating a bunch of objects that look or behave similarly.
    • When you “unhook” an object from all of the variables that reference it, the object becomes garbage.
    • Other kinds of objects include functions and regular expressions.
    • JavaScript has a set type in its standard library.
    • The typeof operator can give you a string that tells you the type of an expression.
    • Values in a strongly typed language are always of a specific type.
    • Values in a weakly typed language can be of any type.
    • When a boolean is expected, a true or false value is used.
    • When a number is expected, an integer value between -2,147,483,648 and 2,147,483,647 is used.
    • When a string is expected, a string value between "a" and "z" is used.
    • To do a type conversion explicitly, use one of the methods listed above.

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    Description

    Test your knowledge of JavaScript data types, strings, objects, prototypes, and type conversion with this quiz. Explore concepts such as characters, code units, prototypes, and type checking.

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