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JavaScript some() method

dailydevtips1 profile image Chris Bongers Originally published at daily-dev-tips.com ・1 min read

Did you ever need to know if one of the elements in an array passed a test?

This is where the some() method comes in handy.

Let's keep using our product array, but let's add a discounted product.

We then want to test if some of our products are discounted.

Using the Javascript some() method

Let's start by creating an array of items.

const items = [
  { name: 'T-shirt plain', price: 9, discount: true },
  { name: 'T-shirt print', price: 20 },
  { name: 'Jeans', price: 30 },
  { name: 'Cap', price: 5 }
];
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Now let's use the some() method to test if we have a discounted product in our array.

const discounted = items.some(item => {
  return item.discount;
});

// Returns true
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If we now remove the discount on our item, it will return false.

Another use case might be that you need to check if all people are under a certain age.

const users = [
  { name: 'Bob', age: 60 },
  { name: 'Sarah', age: 20 },
  { name: 'Billy', age: 18 },
];

const ageRestriction = users.some(user => {
  return user.age <= 18;
});

// Returns true
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This return true, because billy is under the age of 18!

The syntax for some is as follows:

const new = original.some(function(value));
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Inside our function, we can check on certain properties the value has.

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Discussion

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pedroview profile image
Maduekwe Pedro

I love this post, but I don't think the second answer will be true since its < and not <= you used there

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defite profile image
Nikita Makhov

Yep. It will be false.

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dailydevtips1 profile image
Chris Bongers Author

Ah woops, yes should be <= my bad.

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j23saw

True, OP please edit the post