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Javascript – creating "some" function

Trying to create "some" function. i.e., return true if any of the elements in teh array satisfies the condition

function some(array, predicate) {
 for (var i = 0; i < array.length; i++) {
 if (predicate(array[i]))
 return true;
 }
 return false;
}
console.log(some([NaN, 3, 4], isNaN));
// → true
console.log(some([2, 3, 4], isNaN));
// → false

Question 1: Above is the solution in the book and I'm not sure why "return false" would overwrite "return true" in every case. The above solution seems to suggest that "return false" will be run only if "return true" was never run – WHY??

My solution looked like this.

var some = function(array, condition) {
 var answer = false;
 for(var i=0; i<array.length; i++) {
 if(condition(array[i])) {answer = true}; 
 }
 return answer
};

Question 2: Is the book solution better because it takes less memory (ie the "answer" variable)?

Thanks!

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  • I feel like my English is terrible in that answer, suggest me an edit if you know how to "word" it better. Commented May 6, 2015 at 19:34

lang-js

AltStyle によって変換されたページ (->オリジナル) /