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Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.
Commonly applied refactorings include:
If many parameters/temporary variables are present:
Complex classes like alert.ts ➔ createAlert often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
1 | /// <reference path="alert.d.ts" /> |
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2 | |||
3 | /** |
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4 | * Bootstrap Alert Generator |
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5 | * @example createAlert( |
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6 | "[title] Opps!", |
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7 | "[description] Something went wrong", |
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8 | "[details] Here is a bunch of text about some stuff that happened.", |
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9 | "[mode|bg-color] danger", |
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10 | true, false, |
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11 | { position: "fixed", bottom: "15px", right: "15px" }); |
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12 | */ |
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13 | function createAlert( |
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14 | /** |
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15 | * Title alert |
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16 | */ |
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17 | title: string, |
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18 | /** |
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19 | * Summary description |
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20 | */ |
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21 | summary: string, |
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22 | /** |
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23 | * Another description |
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24 | */ |
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25 | details: string, |
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26 | /** |
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27 | * basic class bootstrap or you can insert color name |
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28 | */ |
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29 | severity: "success" | "error" | "warning" | "info" | "danger", |
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30 | /** |
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31 | * can be closed ? |
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32 | */ |
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33 | dismissible: boolean, |
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34 | /** |
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35 | * auto closed ? |
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36 | */ |
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37 | autoDismiss: boolean, |
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38 | /** |
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39 | * Fill `CSSProperties` object or insert CSS object string |
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40 | * @example {position: 'fixed', top: '5px', right: '5px'} |
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41 | * @example 'position:fixed;top:10px;left:10px;' |
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42 | */ |
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43 | options: React.CSSProperties | string |
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44 | ) { |
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45 | if (severity == "error") { |
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46 | severity = "danger"; |
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47 | } |
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48 | |||
49 | if (!$("style#alertcss")) { |
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50 | createStyle( |
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51 | `#pageMessages { |
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52 | position: fixed; |
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53 | bottom: 15px; |
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54 | right: 15px; |
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55 | width: 30%; |
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56 | } |
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57 | |||
58 | #pageMessages .alert { |
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59 | position: relative; |
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60 | } |
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61 | |||
62 | #pageMessages .alert .close { |
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63 | position: absolute; |
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64 | top: 5px; |
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65 | right: 5px; |
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66 | font-size: 1em; |
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67 | } |
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68 | |||
69 | #pageMessages .alert .fa { |
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70 | margin-right:.3em; |
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71 | }`, |
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72 | { id: "alertcss" } |
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73 | ); |
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74 | } |
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75 | |||
76 | if (!$("#pageMessages").length) { |
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77 | var style: string = ""; |
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78 | if (typeof options == "string") { |
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79 | style = options; |
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80 | } else if (typeof options == "object") { |
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81 | if (options.length) { |
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82 | for (const key in options) { |
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83 | if (options.hasOwnProperty(key)) { |
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84 | var value = options[key]; |
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85 | if (value && value.length) { |
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86 | style += `${key}: ${value};`; |
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87 | } |
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88 | } |
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89 | } |
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90 | } else { |
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91 | style = "position: fixed;bottom: 15px;right: 15px;width: 30%;"; |
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92 | } |
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93 | } |
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94 | $("body").append('<div id="pageMessages" style="' + style + '"></div>'); |
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95 | } |
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96 | |||
97 | var iconMap = { |
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98 | info: "fa fa-info-circle", |
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99 | success: "fa fa-thumbs-up", |
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100 | warning: "fa fa-exclamation-triangle", |
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101 | danger: "fa ffa fa-exclamation-circle", |
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102 | }; |
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103 | |||
104 | var iconAdded = false; |
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105 | |||
106 | var alertClasses = ["alert", "animated", "flipInX"]; |
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107 | alertClasses.push("alert-" + severity.toLowerCase()); |
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108 | |||
109 | if (dismissible) { |
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110 | alertClasses.push("alert-dismissible"); |
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111 | } |
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112 | |||
113 | var msgIcon = $("<i />", { |
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114 | class: iconMap[severity], // you need to quote "class" since it's a reserved keyword |
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115 | }); |
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116 | |||
117 | var msg = $("<div />", { |
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118 | class: alertClasses.join(" "), // you need to quote "class" since it's a reserved keyword |
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119 | }); |
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120 | |||
121 | if (title) { |
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122 | var msgTitle = $("<h4 />", { |
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123 | html: title, |
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124 | }).appendTo(msg); |
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125 | |||
126 | if (!iconAdded) { |
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127 | msgTitle.prepend(msgIcon); |
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128 | iconAdded = true; |
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129 | } |
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130 | } |
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131 | |||
132 | if (summary) { |
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133 | var msgSummary = $("<strong />", { |
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134 | html: summary, |
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135 | }).appendTo(msg); |
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136 | |||
137 | if (!iconAdded) { |
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138 | msgSummary.prepend(msgIcon); |
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139 | iconAdded = true; |
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140 | } |
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141 | } |
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142 | |||
143 | if (details) { |
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144 | var msgDetails = $("<p />", { |
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145 | html: details, |
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146 | }).appendTo(msg); |
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147 | |||
148 | if (!iconAdded) { |
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149 | msgDetails.prepend(msgIcon); |
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150 | iconAdded = true; |
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151 | } |
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152 | } |
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153 | |||
154 | if (dismissible) { |
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155 | var msgClose = $("<span />", { |
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156 | class: "close", // you need to quote "class" since it's a reserved keyword |
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157 | "data-dismiss": "alert", |
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158 | html: "<i class='fa fa-times-circle'></i>", |
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159 | }).appendTo(msg); |
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160 | } |
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161 | |||
162 | $("#pageMessages").prepend(msg); |
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163 | |||
164 | if (autoDismiss) { |
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165 | setTimeout(function () { |
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166 | msg.addClass("flipOutX"); |
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167 | setTimeout(function () { |
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168 | msg.remove(); |
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169 | }, 1000); |
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170 | }, 5000); |
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171 | } |
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202 |