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38 lines
4.1 KiB
38 lines
4.1 KiB
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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/**
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* Coerces a value to an array of trimmed non-empty strings.
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* Any input that is not an array, `null` or `undefined` will be turned into a string
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* via `toString()` and subsequently split with the given separator.
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* `null` and `undefined` will result in an empty array.
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* This results in the following outcomes:
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* - `null` -> `[]`
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* - `[null]` -> `["null"]`
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* - `["a", "b ", " "]` -> `["a", "b"]`
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* - `[1, [2, 3]]` -> `["1", "2,3"]`
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* - `[{ a: 0 }]` -> `["[object Object]"]`
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* - `{ a: 0 }` -> `["[object", "Object]"]`
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*
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* Useful for defining CSS classes or table columns.
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* @param value the value to coerce into an array of strings
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* @param separator split-separator if value isn't an array
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*/
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export function coerceStringArray(value, separator = /\s+/) {
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const result = [];
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if (value != null) {
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const sourceValues = Array.isArray(value) ? value : `${value}`.split(separator);
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for (const sourceValue of sourceValues) {
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const trimmedString = `${sourceValue}`.trim();
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if (trimmedString) {
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result.push(trimmedString);
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}
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}
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}
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return result;
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}
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