| 1 | import { REGEX_HEX_NOPREFIX, REGEX_HEX_PREFIXED } from '../is/hex.js';
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| 2 | /**
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| 3 | * @name hexStripPrefix
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| 4 | * @summary Strips any leading `0x` prefix.
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| 5 | * @description
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| 6 | * Tests for the existence of a `0x` prefix, and returns the value without the prefix. Un-prefixed values are returned as-is.
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| 7 | * @example
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| 8 | * <BR>
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| 9 | *
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| 10 | * ```javascript
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| 11 | * import { hexStripPrefix } from '@polkadot/util';
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| 12 | *
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| 13 | * console.log('stripped', hexStripPrefix('0x1234')); // => 1234
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| 14 | * ```
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| 15 | */
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| 16 | export function hexStripPrefix(value) {
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| 17 | if (!value || value === '0x') {
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| 18 | return '';
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| 19 | }
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| 20 | else if (REGEX_HEX_PREFIXED.test(value)) {
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| 21 | return value.substring(2);
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| 22 | }
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| 23 | else if (REGEX_HEX_NOPREFIX.test(value)) {
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| 24 | return value;
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| 25 | }
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| 26 | throw new Error(`Expected hex value to convert, found '${value}'`);
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| 27 | }
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