action-debian-package/node_modules/ramda/es/takeWhile.js

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2020-03-26 14:37:35 +00:00
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 =
/*#__PURE__*/
_curry2(
/*#__PURE__*/
_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;