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65 lines
1.8 KiB
65 lines
1.8 KiB
import _curry2 from "./internal/_curry2.js";
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import _isArray from "./internal/_isArray.js";
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import _isFunction from "./internal/_isFunction.js";
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import _isString from "./internal/_isString.js";
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import toString from "./toString.js";
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/**
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* Returns the result of concatenating the given lists or strings.
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*
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* Note: `R.concat` expects both arguments to be of the same type,
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* unlike the native `Array.prototype.concat` method. It will throw
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* an error if you `concat` an Array with a non-Array value.
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*
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* Dispatches to the `concat` method of the first argument, if present.
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* Can also concatenate two members of a [fantasy-land
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* compatible semigroup](https://github.com/fantasyland/fantasy-land#semigroup).
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*
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* @func
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* @memberOf R
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* @since v0.1.0
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* @category List
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* @sig [a] -> [a] -> [a]
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* @sig String -> String -> String
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* @param {Array|String} firstList The first list
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* @param {Array|String} secondList The second list
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* @return {Array|String} A list consisting of the elements of `firstList` followed by the elements of
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* `secondList`.
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*
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* @example
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*
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* R.concat('ABC', 'DEF'); // 'ABCDEF'
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* R.concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]
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* R.concat([], []); //=> []
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*/
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var concat =
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/*#__PURE__*/
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_curry2(function concat(a, b) {
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if (_isArray(a)) {
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if (_isArray(b)) {
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return a.concat(b);
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}
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throw new TypeError(toString(b) + ' is not an array');
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}
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if (_isString(a)) {
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if (_isString(b)) {
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return a + b;
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}
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throw new TypeError(toString(b) + ' is not a string');
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}
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if (a != null && _isFunction(a['fantasy-land/concat'])) {
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return a['fantasy-land/concat'](b);
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}
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if (a != null && _isFunction(a.concat)) {
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return a.concat(b);
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}
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throw new TypeError(toString(a) + ' does not have a method named "concat" or "fantasy-land/concat"');
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});
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export default concat;
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