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The applyMap() method replace grid records with the results of calling a provided function on every element in the grid records array. 

Parameter

1. Callback function that receives the following arguments:
   1. Record object with properties for each field in the grid
   2. Index - the zero-based index of the current grid record being processed
   3. Records array - array representing all of the grid records

The function must return a record object

 Example

if (checkAll) {  // Check all boxes in the grid
  display.grid.applyMap(record => {
    record.checked = true; 
    return record; 
  });
}

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