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TypeScript code snippet – How to add id in array javascript?

let data = [{
    color: "red",
    value: "#f00"
}, {
    color: "green",
    value: "#0f0"
}, {
    color: "blue",
    value: "#00f"
}, {
    color: "cyan",
    value: "#0ff"
}, {
    color: "magenta",
    value: "#f0f"
}, {
    color: "green",
    value: "#ff0"
}, {
    color: "black",
    value: "#000"
}];

data.forEach((o, i) => o.id = i + 1);

console.log(data);
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