javascript - Why doesn't my conditional operator work? -


why function return undefined instead of "old"? 

function test(age) {   12 < age ? "old" : "young"; }  test(15);

your condition fine. need return

function test(age) {    return 12 < age ? "old" : "young";  }    console.log(test(15));

when leave off return statement, function returns undefined default.


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