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/trycf-gist.cfm

Created April 27, 2017 14:11
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trycf-gist.cfm
<p>Using closures, it is possible to create an "object-like" struct with cfml and not using any components. It allows you to do encapsulation, have methods, do chaining, etc. It's api is pretty much identical to an object, except that you use a function to create it (instead of new). ACF10+ and Lucee 4.5+</p>
<cfscript>
//this version encapsulates the value, you cannot update it from the outside
function make (required numeric input) {
var value = input;
var o = {
add: function (required numeric input) {
value += input;
return o;
},
subtract: function (required numeric input) {
value -= input;
return o;
},
multiply: function (required numeric input) {
value *= input;
return o;
},
divide: function (required numeric input) {
value /= input;
return o;
},
get: function () {
return value;
}
};
return o;
}
function print (value, label) {
writeoutput("<pre>" & label & ": " & value & "<br /></pre>");
}
print(make(1).get(), "make(1).get()");
print(make(1).add(1).get(), "make(1).add(1).get()");
print(make(2).add(3).subtract(1).multiply(5).divide(6).get(), "make(2).add(3).subtract(1).multiply(5).divide(6).get()");
writedump(var=make(1).add(2), expand=false);
//this version exposes the value, and allows you to see and update it outside
function makeExposedProperties (required numeric input) {
var o = {
add: function (required numeric input) {
o.value += input;
return o;
},
subtract: function (required numeric input) {
o.value -= input;
return o;
},
multiply: function (required numeric input) {
o.value *= input;
return o;
},
divide: function (required numeric input) {
o.value /= input;
return o;
},
get: function () {
return o.value;
},
value: input
};
return o;
}
print(makeExposedProperties(1).value, "makeExposedProperties(1).value");
print(makeExposedProperties(1).add(1).value, "makeExposedProperties(1).add(1).value");
print(makeExposedProperties(2).add(3).subtract(1).multiply(5).divide(6).value, "makeExposedProperties(2).add(3).subtract(1).multiply(5).divide(6).value");
x = makeExposedProperties(1).add(1);
x.value += 1;
print(x.add(1).get(), "x = makeExposedProperties(1).add(1);x.value += 1;x.add(1).get()");
writedump(var=makeExposedProperties(1).add(2), expand=false);
</cfscript>
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