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first-key.js 264 B

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  1. 'use strict';
  2. var value = require('./valid-value')
  3. , propertyIsEnumerable = Object.prototype.propertyIsEnumerable;
  4. module.exports = function (obj) {
  5. var i;
  6. value(obj);
  7. for (i in obj) {
  8. if (propertyIsEnumerable.call(obj, i)) return i;
  9. }
  10. return null;
  11. };