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Notes on Functional Thinking

Chap2. Shift

3 common building blocks of functional language

1. Filter Use filter to produce a subset of a collection based on supplied filtering criteria.

2. Map

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Eloquent JavaScript

http://eloquentjavascript.net/

Chap1. Values, Types, and Operators

There are six basic types of values in JavaScript: numbers, strings, Booleans, objects, functions, and undefined values

JavaScript uses a fixed number of bits, namely 64 of them, to store a single number value

There are three special values in JavaScript that are considered numbers but don’t behave like normal numbers: Infinity, -Infinity and NaN

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package main

import (
    "fmt"
    "time"

    "github.com/csigo/metric"
)

var (

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package main

import (
	"bufio"
	"flag"
	"fmt"
	"os/exec"
	"regexp"
	"strings"
)

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func (e *Encryptor) Run(src, dst string) error {
    dat, err := ioutil.ReadFile(src)
    if err != nil {
        return nil
    }

    result := e.encrypt(dat)

    return ioutil.WriteFile(dst, result, 0644)
}

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func (e *Encryptor) Run(srcType, dstType string) error {
    var src []byte
    switch srcType {
    case "file":
        src = e.readFromFile(...)
    case "database":
        src = e.readFromDatabase(...)
    }

    // encrypt

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func (e *Encryptor) Run(srcType, dstType string) error {
    var src []byte
    switch srcType {
    case "file":
        src = e.readFromFile(x, y, z)
    case "database":
        src = e.readFromDatabase(i, j)
    }

    // encrypt

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func (e *Encryptor) Run(
    srcType, dstType, x, y, z, i, j string,
) error {
    var src []byte
    switch srcType {
    case "file":
        src = e.readFromFile(x, y, z)
    case "database":
        src = e.readFromDatabase(i, j)
    }

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type IReader interface {
    Read() ([]byte, error)
}

type IWriter interface {
    Write(dat []byte) error
}

func (e *Encryptor) Run(r IReader, w IWriter) error {
    // read file

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type fileReader struct {
    src string
}

func (f *fileReader) Read() ([]byte, error) {
    return ioutil.ReadFile(f.src)
}

type dbReader struct {
    host  string