Checking defined item in enum

2018-06-09 01:58:56

This question already has an answer here:

How do I check if an object has a property in JavaScript? 22 answers

In this special case, you could access the property and if the result is falsey, then take the default property 99 .

const getAttributes = id => uiElementAttributes[id] || uiElementAttributes[99];

Otherwise, you could use the in operator, or the suggested Object#hasOwnProperty .

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