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桃花镇童长老
桃花镇童长老

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StrUtil, string tool class

#harmony #harmonyos #arkts

Introduction and description of harmony-utils

harmony-utils A HarmonyOS tool library with rich features and extremely easy to use, with the help of many practical tools, is committed to helping developers quickly build Hongmeng applications. Its encapsulated tools cover APP, device, screen, authorization, notification, inter-thread communication, pop-up frames, toast, biometric authentication, user preferences, taking photos, albums, scanning codes, files, logs, exception capture, characters, strings, numbers, collections, dates, random, base64, encryption, decryption, JSON and other functions, which can meet various development needs.

picker_utils It is a sub-store split by harmony-utils, including PickerUtil, PhotoHelper, and ScanUtil.

Download and install

ohpm i @pura/harmony-utils

ohpm i @pura/picker_utils

  //Global initialization method, initialized in the onCreate method of UIAbility AppUtil.init()
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    AppUtil.init(this.context);
  }
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API methods and usage

isNull determines whether the string is empty (undefined, null) 
let str0 = '哈哈哈哈';
let str1 = '';
let str2 = null;
let str3 = undefined;
let bl0 = StrUtil.isNull(str0);
let bl1 = StrUtil.isNull(str1);
let bl2 = StrUtil.isNull(str2);
let bl3 = StrUtil.isNull(str3);
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isNotNull determines whether the string is not defined, null 
let str0 = '哈哈哈哈';
let str1 = '';
let str2 = null;
let str3 = undefined;
let bn0 = StrUtil.isNotNull(str0);
let bn1 = StrUtil.isNotNull(str1);
let bn2 = StrUtil.isNotNull(str2);
let bn3 = StrUtil.isNotNull(str3);
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isEmpty determines whether the string is empty (undefined, null, string length is 0) 
let str0 = '哈哈哈哈';
let str1 = '';
let str2 = null;
let str3 = undefined;
let bl0 = StrUtil.isEmpty(str0);
let bl1 = StrUtil.isEmpty(str1);
let bl2 = StrUtil.isEmpty(str2);
let bl3 = StrUtil.isEmpty(str3);
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isNotEmpty determines whether the string is non-empty (undefined, null, string length is 0) 
let str0 = '哈哈哈哈';
let str1 = '';
let str2 = null;
let str3 = undefined;
let bn0 = StrUtil.isNotEmpty(str0);
let bn1 = StrUtil.isNotEmpty(str1);
let bn2 = StrUtil.isNotEmpty(str2);
let bn3 = StrUtil.isNotEmpty(str3);
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isBlank determines whether the string is empty and whitespace (whitespace includes spaces, tabs, full-width spaces and uninterrupted spaces) 
let str0 = '\t\n  ';
let str1 = '      ';
let str2 = " \t \t ";
let str3 = " 哈 哈 ";
let bl0 = StrUtil.isBlank(str0);
let bl1 = StrUtil.isBlank(str1);
let bl2 = StrUtil.isBlank(str2);
let bl3 = StrUtil.isBlank(str3);
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isNotBlank determines whether the string is non-empty 
let str0 = '\t\n  ';
let str1 = '      ';
let str2 = " \t \t ";
let str3 = " 哈 哈 ";
let bn0 = StrUtil.isNotBlank(str0);
let bn1 = StrUtil.isNotBlank(str1);
let bn2 = StrUtil.isNotBlank(str2);
let bn3 = StrUtil.isNotBlank(str3);
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trim Removes spaces at both ends of strings 
let str1 = " 　 H e llo  　 World \t ";
let str2 = "   呵呵\n嘿\t嘿   哈哈 ";
let trimStr1 = StrUtil.trim(str1);
let trimStr2 = StrUtil.trim(str2);
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trimAll Removes all spaces in the string 
let str1 = " 　 H e llo  　 World \t ";
let str2 = "   呵呵\n嘿\t嘿   哈哈 ";
let trimStr1 = StrUtil.trimAll(str1);
let trimStr2 = StrUtil.trimAll(str2);
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replace the matching regular in the string to the given string 
let str1 = "阿超是一个好人,小阿超也是一个好人";
let str = StrUtil.replace(str1, "阿超", "张三");
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replaceAll replaces all matching regulars in the string to the given string 
let str1 = "阿超是一个好人,小阿超也是一个好人";
let strAll = StrUtil.replaceAll(str1, "好人", " HAO-REN ");
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startsWith determines whether a string starts with the given string 
let str1 = "大聪明是一个好人,DSB也是一个好人";
let startsWith = StrUtil.startsWith(str1, "大聪明");
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endsWith determines whether a string ends with the given string 
let str1 = "大聪明是一个好人,DSB也是一个好人";
let endsWith = StrUtil.endsWith(str1, "好人");
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repeat the string number of times 
let str2 = "千秋万代";
let strs = StrUtil.repeat(str2, 6);
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toLower converts the entire string to lowercase 
let str = "anima,For generations to come, Forever Immortal,IT is SB";
let str1 = StrUtil.toLower(str);
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toUpper Converts the entire string to uppercase 
let str = "anima,For generations to come, Forever Immortal,IT is SB";
let str2 = StrUtil.toUpper(str);
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capitalize Converts the first letter of the string to uppercase, and the rest is lowercase 
let str = "anima,For generations to come, Forever Immortal,IT is SB";
let str3 = StrUtil.capitalize(str);
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equal determines whether two incoming values ​​or strings are equal 
let bl1 = StrUtil.equal("ASX1", "ASX1");
let bl2 = StrUtil.equal("ASX1", "AS1");
let bl4 = StrUtil.equal(26, 26);
let bl5 = StrUtil.equal(26, 29);
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notEqual determines whether two incoming values ​​or strings are not equal 
let bl3 = StrUtil.notEqual("AS1", "ASX1");
let bl6 = StrUtil.notEqual(22, 32);
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strToUint8Array string to Uint8Array 
let str1 = "我是笑哈哈";
let unit8Array = StrUtil.strToUint8Array(str1);
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unit8ArrayToStr Uint8Array to string 
let str1 = "我是笑哈哈";
let unit8Array = StrUtil.strToUint8Array(str1);
let str = StrUtil.unit8ArrayToStr(unit8Array);
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strToBase64 string to Base64 string 
let str1 = "我是笑面虎";
let base64Str = StrUtil.strToBase64(str1);
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base64ToStr Base64 string to string 
let str1 = "我是笑面虎";
let base64Str = StrUtil.strToBase64(str1);
let str = StrUtil.base64ToStr(base64Str);
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strToBuffer string to ArrayBuffer 
let str1 = "我是乐哈哈";
let buff = StrUtil.strToBuffer(str1);
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bufferToStr ArrayBuffer to string 
let str1 = "我是乐哈哈";
let buff = StrUtil.strToBuffer(str1);
let str = StrUtil.bufferToStr(buff);
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bufferToUint8Array ArrayBuffer to Uint8Array 
let str1 = "我是甜啦啦";
let buff1 = StrUtil.strToBuffer(str1);
let unit8Array = StrUtil.bufferToUint8Array(buff1);
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unit8ArrayToBuffer Uint8Array to ArrayBuffer 
let str1 = "我是甜啦啦";
let buff1 = StrUtil.strToBuffer(str1);
let unit8Array = StrUtil.bufferToUint8Array(buff1);
let buff = StrUtil.unit8ArrayToBuffer(unit8Array);
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getErrorStr Gets the JSON string of Error 
let error = new Error("未知异常！");
let errorStr = StrUtil.getErrorStr(error as BusinessError);
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getErrnoToString Get detailed information corresponding to the system error code 
let errStr1 = StrUtil.getErrnoToString(202);
let errStr2 = StrUtil.getErrnoToString(1600004);
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