#default-values code explainers

ruby

def build_pivot_table(sales)
  pivot = sales.each_with_object(Hash.new { |h, k| h[k] = Hash.new(0.0) }) do |record, table|
    region = record.fetch(:region)
    quarter = record.fetch(:quarter)

Building a pivot table in Ruby

aggregation nested-hashes default-values

Intermediate 9 steps

go

package search
 
import (
	"net/url"

Building a query URL from a Filter struct in Go

url-encoding struct-methods input-validation

Intermediate 8 steps

rust

use serde::Deserialize;
use serde_json::Value;
use std::collections::HashMap;

Modeling nested JSON with serde in Rust

deserialization json struct-mapping

Intermediate 9 steps