Write Concise Declarative Functions with ES6 help

JavaScript
#1

Tell us what’s happening:

I don’t know why can’t work?
Because I have dele function.:expressionless:

Your code so far


// change code below this line
const bicycle = {
  gear: 2,
  setGear: (newGear) {
    "use strict";
    this.gear = newGear;
  }
};
// change code above this line
bicycle.setGear(3);
console.log(bicycle.gear);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/es6/write-concise-declarative-functions-with-es6

#2

in concole there is a hint:
SyntaxError: unknown: Unexpected token, expected , (4:21)

and this is marked:
setGear: (newGear) {

compare that with the example:
sayHello() {

#3