63 lines
1.7 KiB
TypeScript
63 lines
1.7 KiB
TypeScript
/**
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* Copyright (C) 2022, Dmitriy Pleshevskiy <dmitriy@ideascup.me>
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*
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* This file is part of Paren
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*
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* Paren is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Paren is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Paren. If not, see <https://www.gnu.org/licenses/>.
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*/
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export function concat(arr: Skipable<string>[]): string {
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return join("", arr);
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}
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export function join(sep: string, arr: Skipable<string>[]): string {
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return arr.filter((item) => !(isSkip(item) || isEmptyStr(item))).join(sep);
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}
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export type Skipable<T> = T | Skip;
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export type Skip = Nil | false;
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export function isNotSkip<T>(val: Skipable<T>): val is T {
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return !isSkip(val);
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}
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export function isSkip(val: unknown): val is Skip {
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return isNil(val) || val === false;
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}
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export type Nilable<T> = T | Nil;
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export type Nil = undefined | null;
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export function isNil(val: unknown): val is Nil {
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return val == null;
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}
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export function isEmptyStr(val: unknown): val is "" {
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return isStr(val) && val.length === 0;
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}
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export function isStr(val: unknown): val is string {
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return typeof val === "string";
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}
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export function isNum(val: unknown): val is number {
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return typeof val === "number";
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}
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export function toArr<T>(val: T | T[]): T[] {
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return Array.isArray(val) ? val : [val];
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}
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