回答編集履歴
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answer
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@@ -1,5 +1,6 @@
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1
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# 1
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2
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2
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[
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3
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[アニメーションGIF](https://teratail.storage.googleapis.com/uploads/contributed_images/169890ce9946de02b6a79a1a6c154683.gif)
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```JavaScript
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5
6
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@@ -75,4 +76,73 @@
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75
76
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getFile("5.txt");
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76
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77
78
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79
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```
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80
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81
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#2
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82
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83
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[アニメーションGIF](https://teratail.storage.googleapis.com/uploads/contributed_images/350cb20d5f1b095dabc37153f4e3e8db.gif)
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84
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```
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85
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86
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const fakeAjax = (fileName, callback) => {
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87
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const MAX = 5000;
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88
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const MIN = 1000;
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89
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const delay = Math.floor(Math.random() * (MAX - MIN) + MIN);
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90
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91
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const responseMockData = {
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92
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"1.txt": "1st request",
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"2.txt": "2nd request",
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94
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"3.txt": "3rd request",
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95
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"4.txt": "4th request",
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96
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"5.txt": "5th request"
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97
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};
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98
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99
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setTimeout(() => {
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callback(responseMockData[fileName]);
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}, delay);
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}
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104
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const output = console.log.bind(this);
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105
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106
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const getFile = (fileName) => {
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107
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let memoizedResult;
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108
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let memoizedCallback;
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109
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110
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fakeAjax(fileName, (response) => {
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111
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if (memoizedCallback) {
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return memoizedCallback(response);
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113
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}
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114
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memoizedResult = response;
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115
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});
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116
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117
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return (callback) => {
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if (memoizedResult) {
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return callback(memoizedResult);
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}
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memoizedCallback = callback;
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122
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};
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123
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}
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125
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const getFile1 = getFile('1.txt');
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const getFile2 = getFile('2.txt');
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127
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const getFile3 = getFile('3.txt');
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128
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const getFile4 = getFile('4.txt');
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129
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const getFile5 = getFile('5.txt');
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131
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132
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getFile1(resultForFile1 => {
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output(resultForFile1);
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getFile2(resultForFile2 => {
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output(resultForFile2);
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136
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getFile3(resultForFile3 => {
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output(resultForFile3);
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138
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getFile4(resultForFile4 => {
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output(resultForFile4);
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140
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getFile5(resultForFile5 => {
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141
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output(resultForFile5);
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142
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output('all done!');
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143
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})
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144
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})
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145
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})
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146
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})
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147
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})
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```
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