50 lines
1.1 KiB
JavaScript
50 lines
1.1 KiB
JavaScript
var _Set =
|
|
/*#__PURE__*/
|
|
require("./internal/_Set");
|
|
|
|
var _curry2 =
|
|
/*#__PURE__*/
|
|
require("./internal/_curry2");
|
|
/**
|
|
* Returns a new list containing only one copy of each element in the original
|
|
* list, based upon the value returned by applying the supplied function to
|
|
* each list element. Prefers the first item if the supplied function produces
|
|
* the same value on two items. [`R.equals`](#equals) is used for comparison.
|
|
*
|
|
* @func
|
|
* @memberOf R
|
|
* @since v0.16.0
|
|
* @category List
|
|
* @sig (a -> b) -> [a] -> [a]
|
|
* @param {Function} fn A function used to produce a value to use during comparisons.
|
|
* @param {Array} list The array to consider.
|
|
* @return {Array} The list of unique items.
|
|
* @example
|
|
*
|
|
* R.uniqBy(Math.abs, [-1, -5, 2, 10, 1, 2]); //=> [-1, -5, 2, 10]
|
|
*/
|
|
|
|
|
|
var uniqBy =
|
|
/*#__PURE__*/
|
|
_curry2(function uniqBy(fn, list) {
|
|
var set = new _Set();
|
|
var result = [];
|
|
var idx = 0;
|
|
var appliedItem, item;
|
|
|
|
while (idx < list.length) {
|
|
item = list[idx];
|
|
appliedItem = fn(item);
|
|
|
|
if (set.add(appliedItem)) {
|
|
result.push(item);
|
|
}
|
|
|
|
idx += 1;
|
|
}
|
|
|
|
return result;
|
|
});
|
|
|
|
module.exports = uniqBy; |