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rename type "userdata" to "java"
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 24 May 2015 12:05:00 -0600
parents d96944467ffc
children b1256e2d19a3
comparison
equal deleted inserted replaced
512:d96944467ffc 513:0dfc01d8d42d
127 127
128 128
129 <p> 129 <p>
130 There are eight basic types in Luan: 130 There are eight basic types in Luan:
131 <i>nil</i>, <i>boolean</i>, <i>number</i>, 131 <i>nil</i>, <i>boolean</i>, <i>number</i>,
132 <i>string</i>, <i>binary</i>, <i>function</i>, <i>userdata</i>, 132 <i>string</i>, <i>binary</i>, <i>function</i>, <i>java</i>,
133 and <i>table</i>. 133 and <i>table</i>.
134 <i>Nil</i> is the type of the value <b>nil</b>, 134 <i>Nil</i> is the type of the value <b>nil</b>,
135 whose main property is to be different from any other value; 135 whose main property is to be different from any other value;
136 it usually represents the absence of a useful value. 136 it usually represents the absence of a useful value.
137 <i>Nil</i> is implemented as the Java value <i>null</i>. 137 <i>Nil</i> is implemented as the Java value <i>null</i>.
151 functions written in Java (see <a href="#fn_calls">Function Calls</a>). 151 functions written in Java (see <a href="#fn_calls">Function Calls</a>).
152 Both are represented by the type <i>function</i>. 152 Both are represented by the type <i>function</i>.
153 153
154 154
155 <p> 155 <p>
156 The type <i>userdata</i> is provided to allow arbitrary Java objects to 156 The type <i>java</i> is provided to allow arbitrary Java objects to
157 be stored in Luan variables. 157 be stored in Luan variables.
158 A userdata value is a Java object that isn't one of the standard Luan types. 158 A <i>java</i> value is a Java object that isn't one of the standard Luan types.
159 Userdata has no predefined operations in Luan, 159 Java values have no predefined operations in Luan,
160 except assignment and identity test. 160 except assignment and identity test.
161 Userdata is useful then Java access is enabled in Luan 161 Java values are useful when Java access is enabled in Luan
162 162
163 163
164 164
165 <p> 165 <p>
166 The type <i>table</i> implements associative arrays, 166 The type <i>table</i> implements associative arrays,
1265 <p> 1265 <p>
1266 You can change the way that Luan compares tables 1266 You can change the way that Luan compares tables
1267 by using the "eq" metamethod (see <a href="#meta">Metatables and Metamethods</a>). 1267 by using the "eq" metamethod (see <a href="#meta">Metatables and Metamethods</a>).
1268 1268
1269 <p> 1269 <p>
1270 Userdata are Java objects. They are compared for equality with the Java <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html#equals(java.lang.Object)"><tt>equals</tt></a> method. 1270 Java values are compared for equality with the Java <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html#equals(java.lang.Object)"><tt>equals</tt></a> method.
1271 1271
1272 <p> 1272 <p>
1273 Equality comparisons do not convert strings to numbers 1273 Equality comparisons do not convert strings to numbers
1274 or vice versa. 1274 or vice versa.
1275 Thus, <tt>"0"==0</tt> evaluates to <b>false</b>, 1275 Thus, <tt>"0"==0</tt> evaluates to <b>false</b>,
2258 "<tt>string</tt>", 2258 "<tt>string</tt>",
2259 "<tt>binary</tt>", 2259 "<tt>binary</tt>",
2260 "<tt>boolean</tt>", 2260 "<tt>boolean</tt>",
2261 "<tt>table</tt>", 2261 "<tt>table</tt>",
2262 "<tt>function</tt>", 2262 "<tt>function</tt>",
2263 and "<tt>userdata</tt>". 2263 and "<tt>java</tt>".
2264 2264
2265 2265
2266 <h4 <%=heading_options%> ><a name="Luan.values"><tt>Luan.values (&middot;&middot;&middot;)</tt></a></h4> 2266 <h4 <%=heading_options%> ><a name="Luan.values"><tt>Luan.values (&middot;&middot;&middot;)</tt></a></h4>
2267 2267
2268 <p> 2268 <p>