Неправильный способ доступа, либо используйте строку в скобках использования. (Точка) оператор.
render() {
const buttonData = this.sounds.map((info) => (
<button>
{info.id}+{info.idnum}
</button>
));
return { buttonData };
}
Или
render() {
const buttonData = sounds.map((info) => (
<button>
{info["id"]}+{info["idnum"]}
</button>
));
return { buttonData };
}
Весь: https://codepen.io/deepakshrma/pen/ZEbYBPm?editors=1111
// import React from "react";
// import ReactDom from "react-dom";
const sounds = [
{
idnum: "1",
id: "Q",
src: "1.html",
},
{
idnum: "1",
id: "W",
src: "",
},
{
idnum: "1",
id: "E",
src: "",
},
{
idnum: "1",
id: "A",
src: "",
},
{
idnum: "1",
id: "S",
src: "",
},
{
idnum: "1",
id: "D",
src: "",
},
{
idnum: "1",
id: "Z",
src: "",
},
{
idnum: "1",
id: "X",
src: "",
},
{
idnum: "1",
id: "C",
src: "",
},
];
class Button extends React.Component {
constructor(props) {
super(props);
}
render() {
const buttonData = sounds.map((info, i) => (
<button>
{info["id"]}+{info["idnum"]}
</button>
));
return (<>{buttonData}</>)
}
}
ReactDOM.render(
<Button />,
document.getElementById('root')
);