lodash/_baseToString.js

import Symbol from './_Symbol.js';
import arrayMap from './_arrayMap.js';
import isArray from './isArray.js';
import isSymbol from './isSymbol.js';

/** Used as references for various `Number` constants. */
const INFINITY = 1 / 0;

/** Used to convert symbols to primitives and strings. */
const symbolProto = Symbol ? Symbol.prototype : undefined;
const symbolToString = symbolProto ? symbolProto.toString : undefined;

/**
 * The base implementation of `_.toString` which doesn't convert nullish
 * values to empty strings.
 *
 * @private
 * @param {*} value The value to process.
 * @returns {string} Returns the string.
 */
function baseToString(value) {
  // Exit early for strings to avoid a performance hit in some environments.
  if (typeof value == 'string') {
    return value;
  }
  if (isArray(value)) {
    // Recursively convert values (susceptible to call stack limits).
    return `${ arrayMap(value, baseToString) }`;
  }
  if (isSymbol(value)) {
    return symbolToString ? symbolToString.call(value) : '';
  }
  const result = `${ value }`;
  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
}

export default baseToString;