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How can I remove a specific item from an array in JavaScript
We are required to write a function for arrays Array.prototype.remove(). It accepts one argument; it is either a callback function or a possible element of the array. If it’s a function then the return value of that function should be considered as the possible element of the array and we have to find and delete that element from the array in place and the function should return true if the element was found and deleted otherwise it should return false.
Therefore, let’s write the code for this function −
Example
const arr = [12, 45, 78, 54, 1, 89, 67];
const names = [{
fName: 'Aashish',
lName: 'Mehta'
}, {
fName: 'Vivek',
lName: 'Chaurasia'
}, {
fName: 'Rahul',
lName: 'Dev'
}];
const remove = function(val){
let index;
if(typeof val === 'function'){
index = this.findIndex(val);
}else{
index = this.indexOf(val);
};
if(index === -1){
return false;
};
return !!this.splice(index, 1)[0];
};
Array.prototype.remove = remove;
console.log(arr.remove(54));
console.log(arr);
console.log(names.remove((el) => el.fName === 'Vivek'));
console.log(names);Output
The output in the console will be −
true
[ 12, 45, 78, 1, 89, 67 ]
true
[
{ fName: 'Aashish', lName: 'Mehta' },
{ fName: 'Rahul', lName: 'Dev' }
]
Updated on: 25-Aug-2020
172 Views
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