JSON Array Literals
This is a JSON string:
'["Ford", "BMW", "Fiat"]'
Inside the JSON string is a JSON array literal:
["Ford", "BMW", "Fiat"]
JSON Arrays
- Arrays in JSON are almost the same as arrays in JavaScript.
- In JSON, array values must be of type string, number, object, array, boolean, or null.
- In JavaScript, array values can be all of the above, plus any other valid JavaScript expression, including functions, dates, and undefined.
JavaScript Arrays
You can create a JavaScript array from a literal:
const myArray = ["Ford", "BMW", "Fiat"];
You can create a JavaScript array by parsing a JSON string:
const myJSON = '["Ford", "BMW", "Fiat"]';const myArray = JSON.parse(myJSON);
Accessing Array Values
You access array values by index:
const firstCar = myArray[0]; // "Ford"
Arrays in Objects
Objects can contain arrays:
{ "name": "John", "age": 30, "cars": ["Ford", "BMW", "Fiat"]}
You access array values within an object by index:
const firstCar = myObj.cars[0]; // "Ford"
Looping Through an Array
You can loop through array values using a for-in loop:
let text = "";for (let i in myObj.cars) { text += myObj.cars[i] + " ";}
Or you can use a for loop:
let text = "";for (let i = 0; i < myObj.cars.length; i++) { text += myObj.cars[i] + " ";}
