Question

here is javascript code:

var test = {
    "h" : function (a) {return a;},
    "say" : "hello"
};

First run:

test['h'] && true

result is true

second run :

true && test['h']

result is function()

my question is, why first run and second run produce different result

Answer 1

The last truthy argument of && is returned. (If there is a non-truthy argument, false is returned, of course.) That’s just how && works.