lodash/_toKey.js

import isSymbol from './isSymbol.js';

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

/**
 * Converts `value` to a string key if it's not a string or symbol.
 *
 * @private
 * @param {*} value The value to inspect.
 * @returns {string|symbol} Returns the key.
 */
function toKey(value) {
  if (typeof value == 'string' || isSymbol(value)) {
    return value;
  }
  const result = `${ value }`;
  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
}

export default toKey;