JavaScript for 루프를 중지하는 방법은 무엇입니까?

JavaScript for 루프를 중지하는 방법은 무엇입니까?

---

이 JavaScript를 사용하여 배열을 반복하고 일치하는 배열 요소를 찾습니다.

var remSize = [], 
    szString, remData, remIndex, i;

for (i = 0; i < remSize.length; i++) {      
    // I'm looking for the index i, when the condition is true
    remSize[i].size == remData.size ? remIndex = i : remIndex = -1;     
}

배열에는 다음 "크기"가 포함 ["34", "36", "38"...]됩니다..

remData.size 내가 찾고있는 "크기"입니다 (예 : "36").

i검색중인 크기 가 인덱스에 있으면 인덱스를 반환해야합니다 . 그렇지 않으면 반환해야합니다 -1. 이 작업을 수행하는 더 좋은 방법이 있습니까?

---

forJavaScript에서 초기에 루프 를 중지하려면 다음을 사용합니다 break.

var remSize = [], 
    szString,
    remData,
    remIndex,
    i;

/* ...I assume there's code here putting entries in `remSize` and assigning something to `remData`... */

remIndex = -1; // Set a default if we don't find it
for (i = 0; i < remSize.length; i++) {      
     // I'm looking for the index i, when the condition is true
     if (remSize[i].size === remData.size) {
          remIndex = i;
          break;       // <=== breaks out of the loop early
     }
}

ES2015 (일명 ES6) 환경에있는 경우이 특정 사용 사례의 경우 Array#findIndex(항목의 인덱스 Array#find를 찾기 위해 ) 또는 (항목 자체를 찾기 위해) 사용할 수 있으며, 둘 다 shimm / polyfilled 할 수 있습니다.

var remSize = [], 
    szString,
    remData,
    remIndex;

/* ...I assume there's code here putting entries in `remSize` and assigning something to `remData`... */

remIndex = remSize.findIndex(function(entry) {
     return entry.size === remData.size;
});

Array#find:

var remSize = [], 
    szString,
    remData,
    remEntry;

/* ...I assume there's code here putting entries in `remSize` and assigning something to `remData`... */

remEntry = remSize.find(function(entry) {
     return entry.size === remData.size;
});

Array#findIndex stops the first time the callback returns a truthy value, returning the index for that call to the callback; it returns -1 if the callback never returns a truthy value. Array#find also stops when it finds what you're looking for, but it returns the entry, not its index (or undefined if the callback never returns a truthy value).

If you're using an ES5-compatible environment (or an ES5 shim), you can use the new some function on arrays, which calls a callback until the callback returns a truthy value:

var remSize = [], 
    szString,
    remData,
    remIndex;

/* ...I assume there's code here putting entries in `remSize` and assigning something to `remData`... */

remIndex = -1; // <== Set a default if we don't find it
remSize.some(function(entry, index) {
    if (entry.size === remData.size) {
        remIndex = index;
        return true; // <== Equivalent of break for `Array#some`
    }
});

If you're using jQuery, you can use jQuery.each to loop through an array; that would look like this:

var remSize = [], 
    szString,
    remData,
    remIndex;

/* ...I assume there's code here putting entries in `remSize` and assigning something to `remData`... */

remIndex = -1; // <== Set a default if we don't find it
jQuery.each(remSize, function(index, entry) {
    if (entry.size === remData.size) {
        remIndex = index;
        return false; // <== Equivalent of break for jQuery.each
    }
});

---

The logic is incorrect. It would always return the result of last element in the array.

remIndex = -1;

for (i = 0; i < remSize.length; i++) {      
    if (remSize[i].size == remData.size) {
        remIndex = i
        break;
    }
}

---

Use for of loop instead which is part of ES2015 release. Unlike forEach, we can use return, break and continue. See https://hacks.mozilla.org/2015/04/es6-in-depth-iterators-and-the-for-of-loop/

let arr = [1,2,3,4,5];
for (let ele of arr) {
  if (ele > 3) break;
  console.log(ele);
}

참고URL : https://stackoverflow.com/questions/9830650/how-to-stop-a-javascript-for-loop