62 lines
1.7 KiB
TypeScript
62 lines
1.7 KiB
TypeScript
/**
|
|
* Copyright (C) 2022, Dmitriy Pleshevskiy <dmitriy@ideascup.me>
|
|
*
|
|
* This file is part of Paren
|
|
*
|
|
* Paren is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Paren is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Paren. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
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];
|
|
}
|