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View Code? Open in Web Editor NEWCourseware and demos for Lynda.com Essential TypeScript course
Courseware and demos for Lynda.com Essential TypeScript course
Below code section will never get executed. object x is of type string (Which is literal), and we are checking for instance String (Which is interface).
if(x instanceof String) {
x.substr(0)
}
See below sample code
function totalLength(x: string, y: string): number
function totalLength(x: any[], y: any[]): number
function totalLength(x: (string | any[]), y: (string | any[])): number {
var total: number = x.length + y.length;
if(x instanceof Array) {
x.push('TypeScript')
}
if(x instanceof String) {
x = x.substr(1,3);
}
console.log(x)
return total;
}
totalLength("first","second");
Expected output: eco
Actual output: first
Hi,
Nice course, I loaded the files, however I get an error: SCRIPT5007: Unable to get property 'todoId' of undefined or null reference in TodoApp.js.
Thanks
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TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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