javascript forEach 多函数数组

Question

I have source code, how to output forEach arrise.tester2 only or JSON stringify perhaps?
This is the code :

var arrise = [{"tester1":"testo","tester2":["testi1","testi2"]},{"tester1":"testc","tester2":["test1","test2"]},{"tester1":"testd","tester3":["tes1","tes3"]}];  

Answer 1

You can use array#map and array#filter . Visit each object in the array and check for tester2 key.

 var arrise = [{"tester1":"testo","tester2":["testi1","testi2"]},{"tester1":"testc","tester2":["test1","test2"]},{"tester1":"testd","tester3":["tes1","tes3"]}]; var result = arrise .map(o => o.tester2) .filter(x => x); console.log(result);

Answer 2

You could filter first by checking the property and then mapp the values.

 var arrise = [{ tester1: "testo", tester2: ["testi1", "testi2"] },{ tester1: "testc", tester2: ["test1", "test2"] }, { tester1: "testd", tester3:["tes1", "tes3"] }], tester2 = arrise .filter(o => o.tester2) .map(o => o.tester2); console.log(tester2);