Match object properties

JavaScript, Object · Nov 3, 2020

Compares two objects to determine if the first one contains equivalent property values to the second one.

Use Object.keys() to get all the keys of the second object.
Use Array.prototype.every(), Object.prototype.hasOwnProperty() and strict comparison to determine if all keys exist in the first object and have the same values.

const matches = (obj, source) =>
  Object.keys(source).every(
    key => obj.hasOwnProperty(key) && obj[key] === source[key]
  );

matches({ age: 25, hair: 'long', beard: true }, { hair: 'long', beard: true });
// true
matches({ hair: 'long', beard: true }, { age: 25, hair: 'long', beard: true });
// false

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