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AI solution for JavaScript Quiz on BFE.dev
43. JSON.stringify()

The code below outputs the following by console.log:

["false",false]
[null,null,null,null]
{"a":null,"b":null,"c":null}

The first console.log statement stringifies an array with two elements: "false" (a string) and false (a boolean). This is printed as ["false", false].

The second console.log statement stringifies an array with four elements: NaN, null, Infinity, and undefined. When using JSON.stringify, NaN is converted to null, null and undefined remain unchanged, and Infinity is converted to null. This is printed as [null,null,null,null].

The third console.log statement stringifies an object with three properties: a, b, and c. The values of these properties are null, NaN, and undefined, respectively. When using JSON.stringify, NaN is converted to null, null and undefined remain unchanged. This is printed as {"a":null,"b":null,"c":null}.