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-rw-r--r--dart.html.markdown37
1 files changed, 32 insertions, 5 deletions
diff --git a/dart.html.markdown b/dart.html.markdown
index fb1856fd..ce6f681b 100644
--- a/dart.html.markdown
+++ b/dart.html.markdown
@@ -503,15 +503,42 @@ example30() {
}
}
-// Optional Positional Parameter
+// Optional Positional Parameter:
// parameter will be disclosed with square bracket [ ] & square bracketed parameter are optional.
example31() {
- findVolume(int length, int breath, [int height]) {
+ findVolume31(int length, int breath, [int height]) {
print('length = $length, breath = $breath, height = $height');
}
- findVolume(10,20,30); //valid
- findVolume(10,20); //also valid
+ findVolume31(10,20,30); //valid
+ findVolume31(10,20); //also valid
+}
+
+// Optional Named Parameter:
+// parameter will be disclosed with curly bracket { }
+// curly bracketed parameter are optional.
+// have to use parameter name to assign a value which separated with colan :
+// in curly bracketed parameter order does not matter
+// these type parameter help us to avoid confusion while passing value for a function which has many parameter.
+example32() {
+ findVolume32(int length, int breath, {int height}) {
+ print('length = $length, breath = $breath, height = $height');
+ }
+
+ findVolume32(10,20,height:30);//valid & we can see the parameter name is mentioned here.
+ findVolume32(10,20);//also valid
+}
+
+// Optional Default Parameter:
+// same like optional named parameter in addition we can assign default value for this parameter.
+// which means no value is passed this default value will be taken.
+example33() {
+ findVolume33(int length, int breath, {int height=10}) {
+ print('length = $length, breath = $breath, height = $height');
+ }
+
+ findVolume33(10,20,height:30);//valid
+ findVolume33(10,20);//valid
}
// Programs have only one entry point in the main function.
@@ -525,7 +552,7 @@ main() {
example8, example9, example10, example11, example12, example13, example14,
example15, example16, example17, example18, example19, example20,
example21, example22, example23, example24, example25, example26,
- example27, example28, example29, example30, example31
+ example27, example28, example29, example30, example31, example32, example33
].forEach((ef) => ef());
}