find() 與filter() 很像，但find() 只會回傳一次值，且是第一次為true 的值。 var findEmpty = people.find(function(item, index, array){ }); ... ... <看更多>

How can I loop through all the entries in an array using JavaScript? I thought it was something like this: forEach(instance in theArray). Where theArray is my ... ... <看更多>

Introduction to JavaScript Array forEach() method ... Typically, when you want to execute a function on every element of an array, you use a for loop statement. ... <看更多>

Copied from https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach. *. * forEach is a recent addition to the ECMA-262 standard ... ... <看更多>

This video explores the powerful forEach function of Arrays. We'll learn how to use this function to iterate and ... ... <看更多>

This might be a case of pre-optimization. Each call to filter will loop over the array, so your first example iterates twice. ... <看更多>