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"""
This directive allows  you to quickly & easily configure AWS Lambda resolvers within your AWS AppSync API.
https://docs.amplify.aws/cli-legacy/graphql-transformer/function/
https://docs.amplify.aws/cli/graphql/custom-business-logic/#lambda-function-resolver
"""
directive @function(name: String!, region: String) on FIELD_DEFINITION

"""This directive allows results to be deferred during execution"""
directive @defer on FIELD

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Content Loading Placeholder

A Pen by Cristi Nebunu on CodePen.

License.

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Ruby String Problems Guide

Core Patterns

1. Character Frequency Pattern

def char_frequency(str)
  str.chars.each_with_object(Hash.new(0)) { |char, freq| freq[char] += 1 }
end

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System Design

It Depends. On What? Tradeoffs

Question

Clarify Problem, Scope, Requirements use cases, who & how? in what sequence of events will users act Traffic, transactions per second at each bottleneck. request types, read v writes Application profiles, cpu, memory intensive, idempotency stateless, stick sessions

High Level Design

Load Balancing & CDNs

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System Design Resiliency Cards

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Card 1: Scalability

• Design for horizontal scaling to handle increased load.
• Implement load balancing to evenly distribute traffic across servers.
• Use sharding or partitioning to manage large datasets.