JS: Array.prototype.some
xArray.some(f)-
- Return
trueif the function f returntruefor at least one element. - As soon as f return
true, exit the iteration and returntrue.
- If array is empty, return false.
- xArray can be Array-Like Object.
f is given 3 args: currentElement currentIndex xArray
[1, 2, 3, 4, 5, 6].some(((x) => (x === 3))) === true
- Return
xArray.some(f, thisArg)-
Use thisArg for this (binding) of f
Example. As Loop with Break
some is useful functional programing style of a loop that exit when a condition is met.
(similar to forEach with break.)
Here is example.
Apply f to each element in order.
Exit the loop when f returns true.
const ff = ((x) => { console.log(x); return x === 3; }); [1, 2, 3, 4, 5, 6].some(ff); /* prints 1 2 3 */
Example. on Empty Array
some on empty array returns false.
[].some((x) => true) === false