streaming-min.js

//     wink-statistics
//     Fast and Numerically Stable Statistical Analysis Utilities.
//
//     Copyright (C) GRAYPE Systems Private Limited
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//     This file is part of “wink-statistics”.
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// ## streaming

// ### min
/**
 *
 * Minimum value is determined incrementally with arrival of each value from the data stream.
 *
 * The [`compute()`](https://winkjs.org/wink-statistics/Stream.html#compute) requires
 * a single numeric value as argument.
 *
 * The [`result()`](https://winkjs.org/wink-statistics/Stream.html#result) returns
 * an object containing `min`.
 *
 * @memberof streaming#
 * @return {Stream} Object containing methods such as `compute()`, `result()` & `reset()`.
 * @example
 * var minimum = min();
 * minimum.compute( 3 );
 * minimum.compute( 6 );
 * minimum.value();
 * // returns 3
 * minimum.result();
 * // returns { min: 3 }
 */
var min = function () {
  var minimum = Infinity;
  var methods = Object.create( null );

  methods.compute = function ( di ) {
    minimum = ( minimum > di ) ? di : minimum;
    return undefined;
  }; // compute()

  methods.value = function () {
    return minimum;
  }; // value()

  methods.result = function () {
    var obj = Object.create( null );
    obj.min = minimum;
    return obj;
  }; // result()

  methods.reset = function () {
    minimum = Infinity;
  }; // reset()

  return methods;
}; // min()

module.exports = min;