Using immutability-helper in React to set variable object key

Figured it out! I needed to use ES6 computed property names and simply edit assignAttribute to:

assignAttribute(field, attribute) {
  var temp = update(this.state.fields, {
    [field]: {$set: attribute}
  });

  this.setState({
    fields: temp
  });
}

You can use the [] syntax if you have dynamic field names:

var data = {}
data[field] = {$set: attribute}

var temp = update(this.state.fields, data)

This gets a lot more concise if you can use ES6.

Using immutability-helper in React to set variable object key

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