omni-tools/src/pages/list/truncate/service.ts

export type SplitOperatorType = 'symbol' | 'regex';

export function truncateList(
    splitOperatorType: SplitOperatorType,
    input: string,
    splitSeparator: string,
    joinSeparator: string,
    end: boolean,
    length?: number,
): string {
    let array: string[];
    let truncatedArray: string[];
    switch (splitOperatorType) {
        case 'symbol':
            array = input.split(splitSeparator);
            break;
        case 'regex':
            array = input.split(new RegExp(splitSeparator));
            break;
    }
    if (length !== undefined) {
        if (length < 0) {
            throw new Error("Length value must be a positive number.")
        }
        truncatedArray = end ? array.slice(0, length) : array.slice(array.length - length, array.length);
        return truncatedArray.join(joinSeparator);
    }
    throw new Error("Length value isn't a value number.");

}