freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.md

---
id: a5deed1811a43193f9f1c841
title: Drop it
challengeType: 5
forumTopicId: 16010
dashedName: drop-it
---

# --description--

Given the array `arr`, iterate through and remove each element starting from the first element (the 0 index) until the function `func` returns `true` when the iterated element is passed through it.

Then return the rest of the array once the condition is satisfied, otherwise, `arr` should be returned as an empty array.

# --hints--

`dropElements([1, 2, 3, 4], function(n) {return n >= 3;})` should return `[3, 4]`.

```js
assert.deepEqual(
  dropElements([1, 2, 3, 4], function (n) {
    return n >= 3;
  }),
  [3, 4]
);
```

`dropElements([0, 1, 0, 1], function(n) {return n === 1;})` should return `[1, 0, 1]`.

```js
assert.deepEqual(
  dropElements([0, 1, 0, 1], function (n) {
    return n === 1;
  }),
  [1, 0, 1]
);
```

`dropElements([1, 2, 3], function(n) {return n > 0;})` should return `[1, 2, 3]`.

```js
assert.deepEqual(
  dropElements([1, 2, 3], function (n) {
    return n > 0;
  }),
  [1, 2, 3]
);
```

`dropElements([1, 2, 3, 4], function(n) {return n > 5;})` should return `[]`.

```js
assert.deepEqual(
  dropElements([1, 2, 3, 4], function (n) {
    return n > 5;
  }),
  []
);
```

`dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;})` should return `[7, 4]`.

```js
assert.deepEqual(
  dropElements([1, 2, 3, 7, 4], function (n) {
    return n > 3;
  }),
  [7, 4]
);
```

`dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;})` should return `[3, 9, 2]`.

```js
assert.deepEqual(
  dropElements([1, 2, 3, 9, 2], function (n) {
    return n > 2;
  }),
  [3, 9, 2]
);
```

# --seed--

## --seed-contents--

```js
function dropElements(arr, func) {
  return arr;
}

dropElements([1, 2, 3], function(n) {return n < 3; });
```

# --solutions--

```js
function dropElements(arr, func) {
  while (arr.length && !func(arr[0])) {
    arr.shift();
  }
  return arr;
}
```