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JavaScript - Coggle Diagram

- - - - rain ? stayHome : goOut;
    - - zero parameters
        
        const functionName = () => {};
      - one parameter
        
        const functionName = paramOne => {};
      - two or more parameters
        
        const functionName = (paramOne, paramTwo) => {};
  - - - SyntaxError
        
        typo creates invalid code
        
        brackets, braces, parentheses
      - ReferenceError
        
        var does not exist
      - TypeError
        
        operation on a value of the wrong type
  - - - def. executes a function once for each array element
      - array1.forEach(element => console.log(element));
    - - def. creates a new array with the results of calling a function on every element in the array
      - const map1 = array1.map(x => x * 2);
    - - returns a single value after iterating through the elements of an array, thereby reducing the array.
      - const reducer = (accumulator, currentValue) => accumulator + currentValue;
  - - - \" escape
    - - true / false
    - - intentional absence of a value
      - when a variable is not set
        var justVar;
- - - - Source
      - Synchronous - result is returned ASA browser can do so
      - async callbacks
    - - Source
  - - - allows the computer to “move on” to other tasks while waiting for the asynchronous operation to complete
  - - - like a gateway / waiter
      - a contract to exchange data
    - - Source
    - - standard format for storing and exchanging data between all programming languages
      - Common Uses
        
        Google Maps
        
        Google Auth 2.0 Authentication
        
        Facebook Social Graph API
        
        Spotify Music Web API
        
        LinkedIn resume API
      - Format
        
        { } hold objects
        
        [ ] hold arrays
        
        "name": value
        
        names must be in double-quoted " "
      - Data Types
        
        string (double-quoted)
        
        number (integer or floating point)
        
        object (name-value pair)
        
        array (comma-delimited)
        
        boolean (true or false)
        
        null
    - - Reading a JSON String
        
        Convert into JS object
        JSON.parse(jsonData)
        
        Access value inside use dot or bracket notation
      - Writing a JSON String
        
        Convert into JSON String
        JSON.stringify(jsObject)