| 1 | // Copyright 2017-2022 @polkadot/util authors & contributors
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| 2 | // SPDX-License-Identifier: Apache-2.0
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| 3 | import { hexFixLength } from "../hex/fixLength.js";
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| 4 | import { isNull } from "../is/null.js";
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| 5 | import { isUndefined } from "../is/undefined.js";
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| 6 | /**
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| 7 | * @name numberToHex
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| 8 | * @summary Creates a hex value from a number.
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| 9 | * @description
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| 10 | * `null`/`undefined`/`NaN` inputs returns an empty `0x` result. `number` input values return the actual bytes value converted to a `hex`. With `bitLength` set, it converts the number to the equivalent size.
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| 11 | * @example
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| 12 | * <BR>
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| 13 | *
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| 14 | * ```javascript
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| 15 | * import { numberToHex } from '@polkadot/util';
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| 16 | *
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| 17 | * numberToHex(0x1234); // => '0x1234'
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| 18 | * numberToHex(0x1234, 32); // => 0x00001234
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| 19 | * ```
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| 20 | */
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| 21 |
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| 22 | export function numberToHex(value, bitLength = -1) {
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| 23 | if (isUndefined(value) || isNull(value) || isNaN(value)) {
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| 24 | return '0x';
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| 25 | }
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| 26 |
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| 27 | const hex = value.toString(16);
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| 28 | return hexFixLength(hex.length % 2 ? `0${hex}` : hex, bitLength, true);
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| 29 | } |
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