94 lines
3.2 KiB
TypeScript
94 lines
3.2 KiB
TypeScript
|
//// [typeGuardsObjectMethods.ts]
|
||
|
|
||
|
// Note that type guards affect types of variables and parameters only and
|
||
|
// have no effect on members of objects such as properties.
|
||
|
|
||
|
// variables in global
|
||
|
var num: number;
|
||
|
var strOrNum: string | number;
|
||
|
var var1: string | number;
|
||
|
var obj1 = {
|
||
|
// Inside method
|
||
|
method(param: string | number) {
|
||
|
// global vars in function declaration
|
||
|
num = typeof var1 === "string" && var1.length; // string
|
||
|
|
||
|
// variables in function declaration
|
||
|
var var2: string | number;
|
||
|
num = typeof var2 === "string" && var2.length; // string
|
||
|
|
||
|
// parameters in function declaration
|
||
|
num = typeof param === "string" && param.length; // string
|
||
|
|
||
|
return strOrNum;
|
||
|
},
|
||
|
get prop() {
|
||
|
// global vars in function declaration
|
||
|
num = typeof var1 === "string" && var1.length; // string
|
||
|
|
||
|
// variables in function declaration
|
||
|
var var2: string | number;
|
||
|
num = typeof var2 === "string" && var2.length; // string
|
||
|
|
||
|
return strOrNum;
|
||
|
},
|
||
|
set prop(param: string | number) {
|
||
|
// global vars in function declaration
|
||
|
num = typeof var1 === "string" && var1.length; // string
|
||
|
|
||
|
// variables in function declaration
|
||
|
var var2: string | number;
|
||
|
num = typeof var2 === "string" && var2.length; // string
|
||
|
|
||
|
// parameters in function declaration
|
||
|
num = typeof param === "string" && param.length; // string
|
||
|
}
|
||
|
};
|
||
|
// return expression of the method
|
||
|
strOrNum = typeof obj1.method(strOrNum) === "string" && obj1.method(strOrNum);
|
||
|
|
||
|
// accessing getter property
|
||
|
strOrNum = typeof obj1.prop === "string" && obj1.prop;
|
||
|
|
||
|
//// [typeGuardsObjectMethods.js]
|
||
|
// Note that type guards affect types of variables and parameters only and
|
||
|
// have no effect on members of objects such as properties.
|
||
|
// variables in global
|
||
|
var num;
|
||
|
var strOrNum;
|
||
|
var var1;
|
||
|
var obj1 = {
|
||
|
// Inside method
|
||
|
method: function (param) {
|
||
|
// global vars in function declaration
|
||
|
num = typeof var1 === "string" && var1.length; // string
|
||
|
// variables in function declaration
|
||
|
var var2;
|
||
|
num = typeof var2 === "string" && var2.length; // string
|
||
|
// parameters in function declaration
|
||
|
num = typeof param === "string" && param.length; // string
|
||
|
return strOrNum;
|
||
|
},
|
||
|
get prop() {
|
||
|
// global vars in function declaration
|
||
|
num = typeof var1 === "string" && var1.length; // string
|
||
|
// variables in function declaration
|
||
|
var var2;
|
||
|
num = typeof var2 === "string" && var2.length; // string
|
||
|
return strOrNum;
|
||
|
},
|
||
|
set prop(param) {
|
||
|
// global vars in function declaration
|
||
|
num = typeof var1 === "string" && var1.length; // string
|
||
|
// variables in function declaration
|
||
|
var var2;
|
||
|
num = typeof var2 === "string" && var2.length; // string
|
||
|
// parameters in function declaration
|
||
|
num = typeof param === "string" && param.length; // string
|
||
|
}
|
||
|
};
|
||
|
// return expression of the method
|
||
|
strOrNum = typeof obj1.method(strOrNum) === "string" && obj1.method(strOrNum);
|
||
|
// accessing getter property
|
||
|
strOrNum = typeof obj1.prop === "string" && obj1.prop;
|