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Check if an object has a property #228

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Check if an object has a property #228

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15 changes: 15 additions & 0 deletions collections/object/check-if-an-object-has-a-property.md
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~~~ javascript
const hasProp = (obj, prop) => typeof obj[prop] !== "undefined";

// Or
const hasProp = (obj, prop) => obj.hasOwnProperty(prop);

// Or
const hasProp = (obj, prop) => prop in obj;

// Example
const user = { id: 0, name: "John Doe" };

hasProp(user, "id") // true
hasProp(user, "email") // false
~~~