Why does the setInterval callback execute only once?

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You used a function call instead of a function reference as the first parameter of the setInterval. Do it like this: 

function timer() {
  console.log("timer!");
}

window.setInterval(timer, 1000);

Or shorter (but when the function gets bigger also less readable):

window.setInterval( function() {
  console.log("timer!");
}, 1000)

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