How to get removed elements of a given array until the passed function returns true in JavaScript ?
Last Updated :
21 Jul, 2023
The arrays in JavaScript have many methods which make many operations easy.
In this article let us see different ways how to get the removed elements before the passed function returns something. Let us take a sorted array and the task is to remove all the elements less than the limiter value passed to the function, we need to print all the removed elements.
These are the following ways by which we get the removed elements of a given array:
In this method, we will take the removed element using the for loop. We can apply the comparator function and get the removed value till the condition gets true.
Example:
Javascript
let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let removeArr = [];
for (let i = 0; i < arr.length; i++) {
if (arr[i] < 6) {
removeArr.push(arr.shift());
} else {
break ;
}
}
console.log(removeArr);
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In a function, if there are multiple return statements only the first return statement gets executed and the function gets completed.
Example: In this example, we will be using the slice() method to get removed elements of a given array until the passed function returns true in JavaScript
Javascript
let array = [1, 2, 2, 3, 4, 5, 6, 6, 7, 8, 8, 8];
let limiter = 5;
let retrieveRemoved = function (array, limiter) {
let i;
for (i = 0; i < array.length; i++) {
if (array[i] >= limiter) {
return array.slice(0, i);
}
}
return array.slice(i);
}
let removed = retrieveRemoved(array, limiter);
console.log( "The removed elements: " + removed);
|
Output
The removed elements: 1,2,2,3,4
Method 3: Using another array
Another array can be used to check the condition. If it does not satisfy the condition, these are the elements to be removed. We push all the elements that don’t satisfy the condition into another array and return the resultant array.
Example: In this example, we will be using another array to get removed elements of a given array until the passed function returns true in JavaScript
Javascript
let array = [1, 2, 2, 3, 4, 5, 6, 6, 7, 8, 8, 8];
let limiter = 5;
let retrieveRemoved = function (array, limiter) {
let i, s;
let res = [];
for (i = 0; i < array.length; i++) {
if (array[i] < limiter) {
res.push(array[i]);
}
else {
s = i;
break ;
}
}
return res;
return array.slice(i);
}
let removed = retrieveRemoved(array, limiter);
console.log( "The removed elements are: " + removed);
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Output
The removed elements are: 1,2,2,3,4
The JavaScript Array filter() Method is used to create a new array from a given array consisting of only those elements from the given array which satisfy a condition set by the argument method.
Example:
Javascript
let array = [1, 2, 2, 3, 4, 5, 6, 6, 7, 8, 8, 8];
let limiter = 5;
function retrieveRemoved(ele) {
return ele < limiter;
}
let removed =
array.filter(retrieveRemoved);
console.log( "The removed elements are: " + removed);
|
Output
The removed elements are: 1,2,2,3,4
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