超好用的字符串拼接类StringBuilder

DevEco Studio 版本：DevEco Studio NEXT Developer Preview2
HarmonyOS API 版本：4.1.0(11)

字符串拼接类 StringBuilder

类似 Java 的 StringBuilder，拼接多个字符串。

1. 支持空字符串过滤
2. 支持多个字符串中间使用指定的字符拼接

StringBuilder.ets代码如下：

/*
 * Copyright (c) 2024 @Dench.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export class StringBuilder {
  private value: string[];

  constructor() {
    this.value = [];
  }

  append(str: string | number | undefined | null): StringBuilder {
    this.value.push(String(str));
    return this;
  }

  appendNotNull(str: string | number | undefined | null): StringBuilder {
    if (str != null) {
      this.value.push(String(str));
    }
    return this;
  }

  build(separator?: string): string {
    return this.value.join(separator);
  }
}

使用 Demo

let res = new StringBuilder()
  .append("123")
  .append("aaa")
  .append("456")
  .append("bbb")
  .append("789")
  .build(".");
console.info(res);