NumberUtil, Number tool class

Introduction and description of harmony-utils

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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);
  }

API methods and usage

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isNaN Check whether the value is NaN

let isNaN1 = NumberUtil.isNaN(112);
let isNaN2 = NumberUtil.isNaN(Number.NaN);

isFinite Check whether the value is a finite number

let isFinite1 = NumberUtil.isFinite(112);
let isFinite2 = NumberUtil.isFinite(Number.MAX_VALUE);

isInteger Checks whether the value is an integer

let isInteger1 = NumberUtil.isInteger(112);
let isInteger2 = NumberUtil.isInteger(11.2);

isSafeInteger Checks whether the value is a safe integer

let isSafeInteger1 = NumberUtil.isSafeInteger(-112);
let isSafeInteger2 = NumberUtil.isSafeInteger(112);

isNumber determines whether it is a numeric value

let bl1 = NumberUtil.isNumber(12345);
let bl2 = NumberUtil.isNumber("12345");
let bl3 = NumberUtil.isNumber(1.212345);
let bl4 = NumberUtil.isNumber(true);
let bl5 = NumberUtil.isNumber(null);
let bl6 = NumberUtil.isNumber(undefined);

isEven Check whether the number is even

let isEven = NumberUtil.isEven(112);

isOdd Check whether the number is an odd number

let isOdd = NumberUtil.isOdd(112);

toNumber Converts a string to Number

let n1 = NumberUtil.toNumber("0.12579AB");
let n2 = NumberUtil.toNumber("123456");
let n3 = NumberUtil.toNumber("128.15624");
let n4 = NumberUtil.toNumber("哈哈");

toInt converts a string to an integer

let n1 = NumberUtil.toInt("0.12579");
let n2 = NumberUtil.toInt("12345");
let n3 = NumberUtil.toInt("128.15624");
let n4 = NumberUtil.toInt("哈哈");

toFloat converts a string to a floating point number

let f1 = NumberUtil.toFloat("0.12579");
let f2 = NumberUtil.toFloat("12345");
let f3 = NumberUtil.toFloat("128.15624");
let f4 = NumberUtil.toFloat("呵呵");

average calculates the average of the numbers

let average1 = NumberUtil.average(1, 2, 3, 4, 5, 6, 7, 8, 9);
let average2 = NumberUtil.average(...[1, 3, 5, 7, 9, 11, 13, 15, 17, 19]);

add

let add = NumberUtil.add(112, 200);

sub subtraction

let sub = NumberUtil.sub(200, 112);

sum

let sum = NumberUtil.sum(10, 12, 16, 18, 36, 22);

toDecimal Construct Decimal

let n1 = NumberUtil.toDecimal(112).toNumber();
let n2 = NumberUtil.toDecimal("200").toNumber();
let n3 = NumberUtil.toDecimal("0200").toNumber();
let n4 = NumberUtil.toDecimal("0.20").toNumber();
let n5 = NumberUtil.toDecimal(0.2222).toNumber();

addDecimal Addition Decimal

let n1 = NumberUtil.addDecimal(112, 200).toNumber();
let n2 = NumberUtil.addDecimal("200", "300").toNumber();
let n3 = NumberUtil.addDecimal("200", 600).toNumber();

subDecimal Subtraction Decimal

let n1 = NumberUtil.subDecimal(112, 20).toNumber();
let n2 = NumberUtil.subDecimal("200", 100).toNumber();
let n3 = NumberUtil.subDecimal("200", 55).toNumber();

sumDecimal sumDecimal

let n1 = NumberUtil.sumDecimal(1, 3, 5, 7, 9).toNumber();
let n2 = NumberUtil.sumDecimal("1", "3", "5", "7", "9").toNumber();
let n3 = NumberUtil.sumDecimal("10", 15, "25", "35", 45).toNumber();