const o = { name: 'Julie', greetBackwards: function() { const getReverseName = function() { console.log(this); // { name: 'Julie', greetBackwards: [Function] } ◆→出力と違うけどOK?←◆ let nameBackwards = ''; for(let i=this.name.length-1; i>=0; i--) { nameBackwards += this.name[i]; } return nameBackwards; }; return `${getReverseName()} si eman ym ,olleH`; }, // greetBackwards のプロパティの関数の終わり }; console.log(o.greetBackwards()); // eiluJ si eman ym ,olleH