| 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 { assert } from "../assert.js";
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| 4 | /**
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| 5 | * @name arrayRange
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| 6 | * @summary Returns a range of numbers ith the size and the specified offset
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| 7 | * @description
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| 8 | * Returns a new array of numbers with the specific size. Optionally, when `startAt`, is provided, it generates the range to start at a specific value.
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| 9 | * @example
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| 10 | * <BR>
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| 11 | *
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| 12 | * ```javascript
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| 13 | * import { arrayRange } from '@polkadot/util';
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| 14 | *
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| 15 | * arrayRange(5); // [0, 1, 2, 3, 4]
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| 16 | * arrayRange(3, 5); // [5, 6, 7]
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| 17 | * ```
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| 18 | */
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| 19 |
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| 20 | export function arrayRange(size, startAt = 0) {
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| 21 | assert(size > 0, 'Expected non-zero, positive number as a range size');
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| 22 | const result = new Array(size);
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| 23 |
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| 24 | for (let i = 0; i < size; i++) {
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| 25 | result[i] = i + startAt;
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| 26 | }
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| 27 |
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| 28 | return result;
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| 29 | } |
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