44 lines
999 B
TypeScript
44 lines
999 B
TypeScript
export function concat(arr: Skipable<string>[]): string {
|
|
return join("", arr);
|
|
}
|
|
|
|
export function join(sep: string, arr: Skipable<string>[]): string {
|
|
return arr.filter((item) => !(isSkip(item) || isEmptyStr(item))).join(sep);
|
|
}
|
|
|
|
export type Skipable<T> = T | Skip;
|
|
|
|
export type Skip = Nil | false;
|
|
|
|
export function isNotSkip<T>(val: Skipable<T>): val is T {
|
|
return !isSkip(val);
|
|
}
|
|
|
|
export function isSkip(val: unknown): val is Skip {
|
|
return isNil(val) || val === false;
|
|
}
|
|
|
|
export type Nilable<T> = T | Nil;
|
|
|
|
export type Nil = undefined | null;
|
|
|
|
export function isNil(val: unknown): val is Nil {
|
|
return val == null;
|
|
}
|
|
|
|
export function isEmptyStr(val: unknown): val is "" {
|
|
return isStr(val) && val.length === 0;
|
|
}
|
|
|
|
export function isStr(val: unknown): val is string {
|
|
return typeof val === "string";
|
|
}
|
|
|
|
export function isNum(val: unknown): val is number {
|
|
return typeof val === "number";
|
|
}
|
|
|
|
export function toArr<T>(val: T | T[]): T[] {
|
|
return Array.isArray(val) ? val : [val];
|
|
}
|