mirror of
https://github.com/pezkuwichain/pezkuwi-common.git
synced 2026-04-22 09:08:03 +00:00
50 lines
1.4 KiB
JavaScript
50 lines
1.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.u8aCmp = u8aCmp;
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const toU8a_js_1 = require("./toU8a.js");
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/**
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* @name u8aCmp
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* @summary Compares two Uint8Arrays for sorting.
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* @description
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* For `UInt8Array` (or hex string) input values returning -1, 0 or +1
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* @example
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* <BR>
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*
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* ```javascript
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* import { u8aCmp } from '@pezkuwi/util';
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*
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* u8aCmp(new Uint8Array([0x67, 0x65]), new Uint8Array([0x68, 0x65])); // -1
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* u8aCmp(new Uint8Array([0x68, 0x65]), new Uint8Array([0x68, 0x65])); // 0
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* u8aCmp(new Uint8Array([0x69, 0x65]), new Uint8Array([0x68, 0x65])); // +1
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* ```
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*/
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function u8aCmp(a, b) {
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const u8aa = (0, toU8a_js_1.u8aToU8a)(a);
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const u8ab = (0, toU8a_js_1.u8aToU8a)(b);
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let i = 0;
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while (true) {
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const overA = i >= u8aa.length;
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const overB = i >= u8ab.length;
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if (overA && overB) {
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// both ends reached
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return 0;
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}
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else if (overA) {
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// a has no more data, b has data
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return -1;
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}
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else if (overB) {
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// b has no more data, a has data
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return 1;
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}
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else if (u8aa[i] !== u8ab[i]) {
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// the number in this index doesn't match
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// (we don't use u8aa[i] - u8ab[i] since that doesn't match with localeCompare)
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return u8aa[i] > u8ab[i]
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? 1
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: -1;
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}
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i++;
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}
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}
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