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Xiaobian to share with you how to use some functions in JavaScript, I believe most people still do not know how to use, so share this article for your reference, I hope you have a lot of gains after reading this article, let's go to understand it together!

some functions

Syntax: arr.some(callbackFn(currentValue[, index[, array]])[, thisArg])

Function: Tests whether at least one element in the array passes the function test provided. It returns a Boolean value.

Return: A test that at least one element of the array passes the callback returns true; a test that all elements fail the callback returns false.

Custom function: mySome.

Array.prototype.mySome = function(callbackFn, thisArg) { if (typeof callbackFn !== 'function') throw ('callbackFn argument must be function'); let element = this, len = element && element.length|| 0; if (! thisArg) thisArg = element; for (let index = 0; index < len; index++) { if (callbackFn.call(thisArg, element[index], index, element)) return true; } return false;} The above is "How to use some functions in JavaScript" All the contents of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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