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 }
];
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
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
This return true, because billy is under the age of 18!
The syntax for some is as follows:
const new = original.some(function(value));
Inside our function, we can check on certain properties the value has.
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Top comments (4)
I love this post, but I don't think the second answer will be true since its < and not <= you used there
Yep. It will be
false
.Ah woops, yes should be <= my bad.
True, OP please edit the post