median.js•729 B
var _curry1 = require('./internal/_curry1');
var _slice = require('./internal/_slice');
var mean = require('./mean');
/**
* Returns the median of the given list of numbers.
*
* @func
* @memberOf R
* @since v0.14.0
* @category Math
* @sig [Number] -> Number
* @param {Array} list
* @return {Number}
* @example
*
* R.median([2, 9, 7]); //=> 7
* R.median([7, 2, 10, 9]); //=> 8
* R.median([]); //=> NaN
*/
module.exports = _curry1(function median(list) {
var len = list.length;
if (len === 0) {
return NaN;
}
var width = 2 - len % 2;
var idx = (len - width) / 2;
return mean(_slice(list).sort(function(a, b) {
return a < b ? -1 : a > b ? 1 : 0;
}).slice(idx, idx + width));
});