big numbers

Examples of creating big number types from and to uint, string, hex, and buffers.

# Node.js

let bn = 75n;
console.log(bn.toString(10));

bn = BigInt("75");
console.log(bn.toString(10));

bn = BigInt(0x4b);
console.log(bn.toString(10));

bn = BigInt("0x4b");
console.log(bn.toString(10));

bn = BigInt("0x" + Buffer.from("4b", "hex").toString("hex"));
console.log(bn.toString(10));
console.log(Number(bn));
console.log(bn.toString(16));
console.log(Buffer.from(bn.toString(16), "hex"));

let bn2 = BigInt(100);
let isEqual = bn === bn2;
console.log(isEqual);

let isGreater = bn > bn2;
console.log(isGreater);

let isLesser = bn < bn2;
console.log(isLesser);

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Output

75
75
75
75
75
75
4b
<Buffer 4b>
false
false
true

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# Go

package main

import (
	"encoding/hex"
	"fmt"
	"math/big"
)

func main() {
	bn := new(big.Int)
	bn.SetUint64(75)
	fmt.Println(bn.String())

	bn = new(big.Int)
	bn.SetString("75", 10)
	fmt.Println(bn.String())

	bn = new(big.Int)
	bn.SetUint64(0x4b)
	fmt.Println(bn.String())

	bn = new(big.Int)
	bn.SetString("4b", 16)
	fmt.Println(bn.String())

	bn = new(big.Int)
	bn.SetBytes([]byte{0x4b})
	fmt.Println(bn.String())
	fmt.Println(bn.Uint64())
	fmt.Println(hex.EncodeToString(bn.Bytes()))
	fmt.Println(bn.Bytes())

	bn2 := big.NewInt(100)
	isEqual := bn.Cmp(bn2) == 0
	fmt.Println(isEqual)

	isGreater := bn.Cmp(bn2) == 1
	fmt.Println(isGreater)

	isLesser := bn.Cmp(bn2) == -1
	fmt.Println(isLesser)
}

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Output

75
75
75
75
75
75
4b
[75]
false
false
true

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编辑

#Go #Node.js

上次更新: 2022/09/30, 11:34:22

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