Is there any data types of nothing available in javascript? I mean like not the null or undefined or 'empty string' but pure nothing. For example, i want to print a variable to console; console.log(variable) it should prints nothing. Is there something like that? Because i needed in do operations in array. Like [x === true ? "Script": `!this should be nothing not empty string but nothing!`] if i print that array i want to see just empty array not null or undefined in that array.

CodePudding user response：

No, there is not. The undefined value comes closes to what you want, but an array with a value is still distinguishable from an array without a value.

You'll need to write

x === true ? ["Script"] : []

instead.

CodePudding user response：

Based on your actual problem, you can use the spread operator (assuming you have multiple values):

To answer your question, however -- no, that does not exist. The closest you can get to that is undefined which exists when trying to access "undefined" JSON properties (try doing window.x in inspect element)

function printOutArrayOptionally(flag) {
  return [...(flag ? ["Value"] : [])]
}

console.log(printOutArrayOptionally(true))
console.log(printOutArrayOptionally(false))