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URLSearchParams.has & delete() in Node
Introduction to has()
This function returns true or false based upon the query argument. The function will return true if name-value pair exists for the argument.
Syntax
var bool = URLSearchParams.has(name);
It will return TRUE if name is present, else FALSE.
Parameters
The input parameter is a name that needs to be searched in the URL.
Example
// Defining the URL as a constant
const myURL = new URL(
'https://example.org/?firstName=John');
// Printing whether the argument exists or not
console.log(myURL.searchParams.get('firstName'));Output
true
Example
// Defining the URL as a constant
const myURL = new URL(
'https://example.org/?firstName=John');
// Printing whether the argument exists or not
console.log(myURL.searchParams.get('lastName'));Output
false
Introduction to delete()
It will delete/remove the occurence of the passed argument.
Syntax
URLSearchParams.delete(name);
It will return a modified URL after removing the passed argument.
Parameters
The name is passed that needs to removed from the URL.
Example
// Defining the URL as a constant
const params = new URLSearchParams( 'firstName=John&lastName=Chan');
console.log(params.toString);
// Removing the 'firstName' parameter
params.delete('firstName');
console.log(params.toString());Output
firstName=John&lastName=Chan lastName=Chan
Example (When arg does not exist)
// Defining the URL as a constant
const params = new URLSearchParams( 'firstName=John&lastName=Chan');
console.log(params.toString);
// Removing the 'firstName' parameter
params.delete('midName');
console.log(params.toString());Output
firstName=John&lastName=Chan firstName=John&lastName=Chan
Updated on: 28-Apr-2021
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