47 lines
1.1 KiB
TypeScript
47 lines
1.1 KiB
TypeScript
// Copyright 2017-2022 @polkadot/util authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { AnyString } from '../types';
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import { CC_TO_LO, CC_TO_UP } from './camelCase';
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/** @internal */
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function converter (map: readonly string[]): (value?: AnyString | null) => string {
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return (value?: AnyString | null): string =>
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value
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? map[value.charCodeAt(0)] + value.slice(1)
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: '';
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}
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/**
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* @name stringLowerFirst
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* @summary Lowercase the first letter of a string
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* @description
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* Lowercase the first letter of a string
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* @example
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* <BR>
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*
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* ```javascript
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* import { stringLowerFirst } from '@polkadot/util';
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*
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* stringLowerFirst('ABC'); // => 'aBC'
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* ```
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*/
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export const stringLowerFirst = converter(CC_TO_LO);
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/**
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* @name stringUpperFirst
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* @summary Uppercase the first letter of a string
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* @description
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* Lowercase the first letter of a string
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* @example
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* <BR>
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*
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* ```javascript
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* import { stringUpperFirst } from '@polkadot/util';
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*
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* stringUpperFirst('abc'); // => 'Abc'
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* ```
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*/
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export const stringUpperFirst = converter(CC_TO_UP);
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