- 1: Set(4) {"+0", "-0", NaN, undefined} - 2: Set(3) {"+0", NaN, undefined} - 3: Set(5) {"+0", "-0", NaN, undefined, NaN} - 4: Set(4) {"+0", NaN, undefined, NaN}

##### Answer: 1 Set has few exceptions from equality check, 1. All NaN values are equal 2. Both +0 and -0 considered as different values

JavaScript Coding Exercise 29 | JSCodingQuestions.com

javascript

1var set = new Set();
2
3set.add("+0").add("-0").add(NaN).add(undefined).add(NaN);
4
5console.log(set);

Set(4) {"+0", "-0", NaN, undefined}

Set(3) {"+0", NaN, undefined}

Set(5) {"+0", "-0", NaN, undefined, NaN}

Set(4) {"+0", NaN, undefined, NaN}