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Add JSON example
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| ## JSON | ||
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| JavaScript Object Notation (JSON) is a lightweight data-interchange format that is easy for humans to read and write. Furthermore, equally simple for machines to generate and/or parse. JSON is completely language agnostic and that's why it's the ideal interchange format. | ||
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| To read more about JSON visit: [json.org](http://json.org). | ||
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| ## Parsing JSON | ||
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| To parse a JSON string received by another application or generated within your existing application: | ||
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| ```go | ||
| import json | ||
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| struct Customer { | ||
| first_name string | ||
| last_name string | ||
| hometown string | ||
| } | ||
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| fn main() { | ||
| customers_string := '[{ "first_name": "Vitor", "last_name": "Oliveira", "hometown": "Rio de Janeiro" }, { "first_name": "Don", "last_name": "Nisnoni", "hometown": "Kupang" }]' | ||
| customers := json.decode([]Customer, customers_string) or { | ||
| eprintln('Failed to parse json') | ||
| return | ||
| } | ||
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| // Print the list of customers | ||
| for customer in customers { | ||
| println('$customer.first_name $customer.last_name: $customer.hometown') | ||
| } | ||
| } | ||
| ``` | ||
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| ## Generating JSON | ||
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| Creating a JSON string for communication or serialization is just as simple. We decode and encode in the example below: | ||
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| ```go | ||
| import json | ||
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| struct Customer { | ||
| first_name string | ||
| last_name string | ||
| hometown string | ||
| } | ||
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| fn main() { | ||
| customer_string := '[{ "first_name": "Vitor", "last_name": "Oliveira", "hometown": "Rio de Janeiro"}]' | ||
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| customer := json.decode([]Customer, customer_string) or { | ||
| eprintln('Failed to parse json') | ||
| return | ||
| } | ||
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| encoded_json := json.encode(customer) | ||
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| println(encoded_json) | ||
| } | ||
| ``` | ||
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| ## Exercises | ||
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| 1. Compare how you handle JSON in your favorite language and V. | ||
| 2. Build an `Address` struct that contains address information. | ||
| 3. Use the `Address` struct to decode and encode a string that contains JSON format. | ||
| 4. Create 2 structs: `Address` and `User` where a user has many addresses. Now receive a string with a nested JSON like `'[{ "first_name": "Vitor", "last_name": "Oliveira", "hometown": "Rio de Janeiro", "addresses": [{ street_name: "Rua Princesa Isabel", city: "Rio de Janeiro", country: "Brazil" }] }]'`, decode and encode it. |