mirror of
https://github.com/swc-project/swc.git
synced 2024-12-21 12:41:54 +03:00
48 lines
1.5 KiB
TypeScript
48 lines
1.5 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/takeWhile.js
|
|
|
|
|
|
import _curry2 from './internal/_curry2.js';
|
|
import _dispatchable from './internal/_dispatchable.js';
|
|
import _xtakeWhile from './internal/_xtakeWhile.js';
|
|
import slice from './slice.js';
|
|
|
|
|
|
/**
|
|
* Returns a new list containing the first `n` elements of a given list,
|
|
* passing each value to the supplied predicate function, and terminating when
|
|
* the predicate function returns `false`. Excludes the element that caused the
|
|
* predicate function to fail. The predicate function is passed one argument:
|
|
* *(value)*.
|
|
*
|
|
* Dispatches to the `takeWhile` method of the second argument, if present.
|
|
*
|
|
* Acts as a transducer if a transformer is given in list position.
|
|
*
|
|
* @func
|
|
* @memberOf R
|
|
* @since v0.1.0
|
|
* @category List
|
|
* @sig (a -> Boolean) -> [a] -> [a]
|
|
* @sig (a -> Boolean) -> String -> String
|
|
* @param {Function} fn The function called per iteration.
|
|
* @param {Array} xs The collection to iterate over.
|
|
* @return {Array} A new array.
|
|
* @see R.dropWhile, R.transduce, R.addIndex
|
|
* @example
|
|
*
|
|
* const isNotFour = x => x !== 4;
|
|
*
|
|
* R.takeWhile(isNotFour, [1, 2, 3, 4, 3, 2, 1]); //=> [1, 2, 3]
|
|
*
|
|
* R.takeWhile(x => x !== 'd' , 'Ramda'); //=> 'Ram'
|
|
*/
|
|
var takeWhile = _curry2(_dispatchable(['takeWhile'], _xtakeWhile, function takeWhile(fn, xs) {
|
|
var idx = 0;
|
|
var len = xs.length;
|
|
while (idx < len && fn(xs[idx])) {
|
|
idx += 1;
|
|
}
|
|
return slice(0, idx, xs);
|
|
}));
|
|
export default takeWhile;
|