It's a new javascript construct in ES 6 that allows you to match property of an object in assignment. The syntax you need is:
const { local: loc } = this.props
which translates to: "declare a constant loc and assign it the value of property local from this.props".
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Espruino
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
It's a new javascript construct in ES 6 that allows you to match property of an object in assignment. The syntax you need is:
const { local: loc } = this.props
which translates to: "declare a constant loc and assign it the value of property local from this.props".