hyperformula/es/interpreter/plugin/CountUniquePlugin.mjs

HyperFormula is a JavaScript engine for efficient processing of spreadsheet-like data and formulas

/**
 * @license
 * Copyright (c) 2025 Handsoncode. All rights reserved.
 */
import { CellError } from "../../Cell.mjs";
import { FunctionArgumentType, FunctionPlugin } from "./FunctionPlugin.mjs";
/**
 * Interpreter plugin containing COUNTUNIQUE function
 */
export class CountUniquePlugin extends FunctionPlugin {
  /**
   * Corresponds to COUNTUNIQUE(Number1, Number2, ...).
   *
   * Returns number of unique numbers from arguments
   *
   * @param ast
   * @param state
   */
  countunique(ast, state) {
    return this.runFunction(ast.args, state, this.metadata('COUNTUNIQUE'), (...args) => {
      const valuesSet = new Set();
      const errorsSet = new Set();
      for (const scalarValue of args) {
        if (scalarValue instanceof CellError) {
          errorsSet.add(scalarValue.type);
        } else if (scalarValue !== '') {
          valuesSet.add(scalarValue);
        }
      }
      return valuesSet.size + errorsSet.size;
    });
  }
}
CountUniquePlugin.implementedFunctions = {
  'COUNTUNIQUE': {
    method: 'countunique',
    parameters: [{
      argumentType: FunctionArgumentType.SCALAR
    }],
    repeatLastArgs: 1,
    expandRanges: true
  }
};