nodejs node . js util . types . IsBiguint64 array()方法

node . js util . types . IsBiguint64 array()方法

原文:https://www . geesforgeks . org/node-js-util-types-isbiguint 64 array-method/

util 模块的 util.types.isBigUint64Array()方法主要是为了支持 Node.js 自带的内部 API 的需求而设计的。

util.types.isBigUint64Array()方法用于检查给定值是否为 BigUint64Array 对象。

语法:

util.types.isBigUint64Array( value )

参数:该函数接受一个参数，如上所述，如下所述:

Value: This is the value to be checked for the BigUint64Array object.

返回值:如果传递的值是 BigUint64Array 的实例，该方法返回一个布尔值，即真，否则返回假。

下面的例子说明了 Node.js 中的 util.types.isBigUint64Array()方法:

例 1:

// Node.js program to demonstrate the    
// util.types.isBigUint64Array() method

// Import the util module
const util = require('util');

// Checking for a big signed 64-bit integer array
isBigUnsignedint64Arr
  = util.types.isBigUint64Array(new BigUint64Array());
console.log("Object is Big Unsigned 64-bit array object:",
  isBigUnsignedint64Arr);

isBigUnsignedint64Arr
  = util.types.isBigUint64Array(new BigInt64Array());
console.log("Object is Big Unsigned 64-bit array object:",
  isBigUnsignedint64Arr);

isBigUnsignedint64Arr
  = util.types.isBigUint64Array(new Int32Array());
console.log("Object is Big Unsigned 64-bit array object:",
  isBigUnsignedint64Arr);

输出:

Object is Big Unsigned 64-bit array object: true
Object is Big Unsigned 64-bit array object: false
Object is Big Unsigned 64-bit array object: false

例 2:

// Node.js program to demonstrate the    
// util.types.isBigUint64Array() method

// Import the util module
const util = require('util');

// Checking a big unsigned 64-bit integer array
let bigUnsigned64Arr
  = new BigUint64Array([16n, 25n, 69n]);
console.log(bigUnsigned64Arr);

isBigUnsignedint64Arr
  = util.types.isBigUint64Array(bigUnsigned64Arr);
console.log("Object is Big Unsigned 64-bit array object:",
  isBigUnsignedint64Arr);

// Checking a big signed 64-bit integer array
let bigSigned64Arr
  = new BigInt64Array([16n, 25n, 69n]);
console.log(bigSigned64Arr);

isBigUnsignedint64Arr
  = util.types.isBigUint64Array(bigSigned64Arr);
console.log("Object is Big Unsigned 64-bit array object:",
  isBigUnsignedint64Arr);

// Checking a unsigned 32-bit integer array
let unsigned32Arr
  = new Uint32Array([16, 25, 69]);
console.log(unsigned32Arr);

isBigUnsignedint64Arr
  = util.types.isBigUint64Array(unsigned32Arr);
console.log("Object is Big Unsigned 64-bit array object:",
  isBigUnsignedint64Arr);

输出:

BigUint64Array [ 16n, 25n, 69n ]
Object is Big Unsigned 64-bit array object: true
BigInt64Array [ 16n, 25n, 69n ]
Object is Big Unsigned 64-bit array object: false
Uint32Array [ 16, 25, 69 ]
Object is Big Unsigned 64-bit array object: false

参考:https://nodejs . org/API/util . html # util _ util _ types _ isbiguint64 array _ value