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Просмотр файла: _extremum.js
define(['./identity', './_cb', './find'], function (identity, _cb, find) {
// The general algorithm behind `_.min` and `_.max`. `compare` should return
// `true` if its first argument is more extreme than (i.e., should be preferred
// over) its second argument, `false` otherwise. `iteratee` and `context`, like
// in other collection functions, let you map the actual values in `collection`
// to the values to `compare`. `decide` is an optional customization point
// which is only present for historical reasons; please don't use it, as it will
// likely be removed in the future.
function extremum(collection, compare, iteratee, context, decide) {
decide || (decide = identity);
// `extremum` is essentially a combined map+reduce with **two** accumulators:
// `result` and `iterResult`, respectively the unmapped and the mapped version
// corresponding to the same element.
var result, iterResult;
iteratee = _cb(iteratee, context);
var first = true;
find(collection, function(value, key) {
var iterValue = iteratee(value, key, collection);
if (first || compare(iterValue, iterResult)) {
result = value;
iterResult = iterValue;
first = false;
}
});
// `extremum` normally returns an unmapped element from `collection`. However,
// `_.min` and `_.max` forcibly return a number even if there is no element
// that maps to a numeric value. Passing both accumulators through `decide`
// before returning enables this behavior.
return decide(result, iterResult);
}
return extremum;
});
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