var isSymbol = require('./isSymbol');

/** Used as references for various `Number` constants. */ 
var 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;
  }
  var result = (value + '');
  return (result == '0' && (1 / value) == -INFINITY) ? ' -0' : result;
}

module.exports = toKey;
