Typeservicesv0.8.2

StringLength

Returns the length of the given string.

type StringLength<S extends string> = string extends S
    ? never
    : StringToArray<S>["length"];

type StringLength<S extends string> = string extends S
    ? never
    : StringToArray<S>["length"];

type A = StringLength<'abcde'>;
//=> 5

type B = StringLength<string>;
//=> never

 String   Template literal

type A = StringLength<'abcde'>;
//=> 5

type B = StringLength<string>;
//=> never

 String   Template literal

S extends string

S extends string

Typeservicesv0.8.2

Returns the length of the given string.

type StringLength<S extends string> = string extends S
    ? never
    : StringToArray<S>["length"];

type StringLength<S extends string> = string extends S
    ? never
    : StringToArray<S>["length"];

type A = StringLength<'abcde'>;
//=> 5

type B = StringLength<string>;
//=> never

 String   Template literal

type A = StringLength<'abcde'>;
//=> 5

type B = StringLength<string>;
//=> never

 String   Template literal

S extends string

S extends string