JavaScript Array Functions

`some()` and `every()` JavaScript Array functions

These help you test if something is true for every element or some elements of an array.

We need some data to test, consider an array of numbers;

const nums = [34, 2, 48, 91, 12, 32];

Now let's say we want to test if every number in the array is less than 100.

nums.every(n => n < 100);

// true => all numbers in the array are less than 100

every loops over the array elements left to right
For each iteration, it calls the given function with the current array element as its 1st argument.
The loop continues until the function returns a falsy value and in that case every returns false - otherwise it returns true

some also works very similar to every

some loops over the array elements left to right.
For each iteration, it calls the given function with the current array element as its 1st argument.
The loop continues, until the function returns a truthy value and in that case some returns true - otherwise it returns false

Now let's use some to test if some number in the array is odd,

nums.some(n => n % 2 == 1);

// true => 91 is odd