test/mjsunit/typeof.js

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// The type of a regular expression should be 'object', including in
// the context of string equality comparisons.

var r = new RegExp;
assertEquals('object', typeof r);
assertTrue(typeof r == 'object');
assertFalse(typeof r == 'function');

function test(x, y) { return x == y; }
assertTrue(test('object', typeof r));

assertFalse(typeof null == "undefined");