getMin.js

/**
 * Find the minimum value of an element in a subform
 * @param  {array} myArray       Subform
 * @param  {string} column       Data column name to aggregate
 * @return {int|boolean}         The minimum value found, or false if array is undefined or data column name is not found
 */
function getMin(myArray, column) {
   if (typeof myArray == "undefined" || myArray == null || Array.isArray(myArray) === false) return false;

   var min_value = false;
   for (var i = 0; i < myArray.length; i++) {
      if (typeof myArray[i][column] !== "undefined") {
         if (min_value === false) {
            min_value = myArray[i][column];
         } else {
            if (Number(min_value) > Number(myArray[i][column])) {
               min_value = myArray[i][column];
            }
         }
      }
   }

   return min_value;
}