xuyazhong

https://github.com/apple/swift/blob/master/stdlib/public/core/Collection.swift

  @_inlineable
  public func map<T>(_ transform: (Iterator.Element) throws -> T) rethrows -> [T] {
    // TODO: swift-3-indexing-model - review the following
    let count: Int = numericCast(self.count)
    if count == 0 {
      return []
    }

xuyazhong

https://github.com/apple/swift/blob/master/stdlib/public/core/SequenceAlgorithms.swift.gyb

@_inlineable
public func flatMap<SegmentOfResult : Sequence>(_ transform: (${GElement}) throws -> SegmentOfResult) rethrows -> [SegmentOfResult.${GElement}] {
    var result: [SegmentOfResult.${GElement}] = []
    for element in self {
      result.append(contentsOf: try transform(element))
    }
    return result
}

xuyazhong

https://github.com/apple/swift/blob/master/stdlib/public/core/Optional.swift

@_inlineable
public func map<U>(_ transform: (Wrapped) throws -> U) rethrows -> U? {
    switch self {
    case .some(let y):
        return .some(try transform(y))
    case .none:
        return .none
    }

xuyazhong

https://github.com/apple/swift/blob/master/stdlib/public/core/Optional.swift

public enum Optional<Wrapped> : ExpressibleByNilLiteral {
    // The compiler has special knowledge of Optional<Wrapped>, including the fact
    // that it is an `enum` with cases named `none` and `some`.
    /// The absence of a value.
    ///
    /// In code, the absence of a value is typically written using the `nil`
    /// literal rather than the explicit `.none` enumeration case.
    case none

xuyazhong

import React, { Component } from 'react';
import { Buffer } from 'buffer'

var crc_table = [
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5,
    0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b,
    0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210,
    0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
    0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c,
    0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401,

xuyazhong

// example
//a.js
// this.callback("abc")
Say(res) {
    // this.callback = (result) => {
    //     console.log("result => ", result)
    // }
    this.callback = res;
    // console.log("this.callback =>", this.callback)
    // console.log("this.callback type =>", typeof(this.callback))

xuyazhong

let getQuery = "" + decodeURIComponent(options.q)
console.log("getQuery =>", getQuery);
wx.showModal({
  title: 'onLoad',
  content: getQuery
})

xuyazhong

  HexString2Bytes(str) {
    var pos = 0;
    var len = str.length;
    if (len % 2 != 0) {
        return null;
    }
    len /= 2;
    var arrBytes = new Array();
    for (var i = 0; i < len; i++) {

xuyazhong

 wx.downloadFile({
        url: path,
        success(res) {
          const downloadPath = res.tempFilePath
          console.log('downloadPath =>', downloadPath)
          wx.openDocument({
            filePath: downloadPath,
            fileType: 'pdf',
            success(res) {
              console.log('打开文档成功 =>', res)