ysjj-system/node_modules/mathjs/lib/esm/function/matrix/forEach.js

import { maxArgumentCount } from '../../utils/function.js';
import { forEach as forEachArray } from '../../utils/array.js';
import { factory } from '../../utils/factory.js';
var name = 'forEach';
var dependencies = ['typed'];
export var createForEach = /* #__PURE__ */factory(name, dependencies, _ref => {
  var {
    typed
  } = _ref;
  /**
   * Iterate over all elements of a matrix/array, and executes the given callback function.
   *
   * Syntax:
   *
   *    math.forEach(x, callback)
   *
   * Examples:
   *
   *    math.forEach([1, 2, 3], function(value) {
   *      console.log(value)
   *    })
   *    // outputs 1, 2, 3
   *
   * See also:
   *
   *    filter, map, sort
   *
   * @param {Matrix | Array} x    The matrix to iterate on.
   * @param {Function} callback   The callback function is invoked with three
   *                              parameters: the value of the element, the index
   *                              of the element, and the Matrix/array being traversed.
   */
  return typed(name, {
    'Array, function': _forEach,
    'Matrix, function': function MatrixFunction(x, callback) {
      x.forEach(callback);
    }
  });
});

/**
 * forEach for a multi dimensional array
 * @param {Array} array
 * @param {Function} callback
 * @private
 */
function _forEach(array, callback) {
  // figure out what number of arguments the callback function expects
  var args = maxArgumentCount(callback);
  var recurse = function recurse(value, index) {
    if (Array.isArray(value)) {
      forEachArray(value, function (child, i) {
        // we create a copy of the index array and append the new index value
        recurse(child, index.concat(i));
      });
    } else {
      // invoke the callback function with the right number of arguments
      if (args === 1) {
        callback(value);
      } else if (args === 2) {
        callback(value, index);
      } else {
        // 3 or -1
        callback(value, index, array);
      }
    }
  };
  recurse(array, []);
}