45 lines
1.1 KiB
TypeScript
45 lines
1.1 KiB
TypeScript
// Copyright 2017-2018 @polkadot/util authors & contributors
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// This software may be modified and distributed under the terms
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// of the Apache-2.0 license. See the LICENSE file for details.
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import './polyfill/textEncoder';
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let encoder: TextEncoder | undefined;
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try {
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encoder = new TextEncoder();
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} catch (error) {
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// noop
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}
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/**
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* @name stringToU8a
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* @signature stringToU8a (value?: string): UInt8Array
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* @summary Creates a Uint8Array object from a utf-8 string.
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* @description
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* String input values return the actual encoded `UInt8Array`. `null` or `undefined` values returns an empty encoded array.
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* @example
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* <BR>
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*
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* ```javascript
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* import { stringToU8a } from '@polkadot/util';
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*
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* stringToU8a('hello'); // [0x68, 0x65, 0x6c, 0x6c, 0x6f]
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* ```
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*/
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export default function stringToU8a (value?: string): Uint8Array {
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if (!value) {
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return new Uint8Array([]);
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} else if (encoder) {
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return encoder.encode(value);
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}
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const u8a = new Uint8Array(value.length);
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for (let i = 0; i < value.length; i++) {
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u8a[i] = value.charCodeAt(i);
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}
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return u8a;
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}
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