Defer example - product name and unit price, log, and the place of defer is important

defer_statement/demo3.go

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+/**
+
+defer statement - the place of defer is important - product name and price - and log implemented
+  
+BSD 3-Clause License
+
+Copyright (c) 2024 Mass Collaboration Labs and contributors
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  
+ **/
+package defer_statement
+
+import "fmt"
+
+type product struct{
+	productName string
+	unitPrice int
+}
+
+func (p product) save(){
+	fmt.Println("Product saved : ", p.productName )
+	Log()
+}
+
+func Demo3(){
+	p:= product{productName:"Laptop", unitPrice:5000}
+	defer p.save() //defer place is important so if we put defer above "Mouse then we can't see mouse"
+	p = product{productName:"Mouse", unitPrice:45}
+	
+	fmt.Println("Success!")
+	fmt.Println(p.productName) // we are able to see "mouse"
+}
+
+func Log(){
+	fmt.Println("Saved log")
+}

defer_statement/demo3.go~

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+package defer_statement
+
+import "fmt"
+
+type product struct{
+	productName string
+	unitPrice int
+}
+
+func (p product) save(){
+	fmt.Println("Product saved : ", p.productName )
+}
+
+func Demo3(){
+	p:= product{productName:"Laptop", unitPrice:5000}
+	p.save()
+	fmt.Println("Success!")
+	
+}