When working with an optional type argument function RECT(T
rect<T extends Date | number>(x1:T, y1:T,x2?:T, y2?:T) {
if(x1 instanceof Date) {
this.opportunityArea.dx = this.returnNumberFunc(x1);
} else {
this.opportunityArea.dx = x1; //**TS2322: Type 'T' is not assignable to type 'number'.**
}
}
The reason it's not functioning properly is due to the fact that the T type is too broad to be fitted into either just a Date or a number. If you utilize a type alias instead of generics, then the function should work correctly.
type DateOrNum = Date | number;
rect(x1: DateOrNum, y1: DateOrNum, x2 ?: DateOrNum, y2 ?: DateOrNum) {
if (x1 instanceof Date) {
this.opportunityArea.dx = this.returnNumberFunc(x1);
} else {
this.opportunityArea.dx = x1;
}
}
When working with TypeScript, I often utilize else if(typeof x1 === 'number') and it functions correctly for me
rect<T extends Date | number>(x1:T, y1:T,x2?:T, y2?:T) {
if(x1 instanceof Date) {
this.opportunityArea.dx = this.returnNumberFunc(x1);
} else if(typeof x1 === 'number'){
this.opportunityArea.dx = x1; //**TS2322: Type 'T' is not assignable to type 'number'.**
}
}
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