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jQuery Utilities

Jquery

jQuery provides several utility functions to simplify common tasks in JavaScript and DOM manipulation. Here are some useful jQuery utility functions:

  1. $.trim():

    • Removes leading and trailing whitespace from a string.
    javascript
    var str = $.trim("   Hello, World!   ");
// str will be "Hello, World!"

  2. $.isArray():

    • Checks if a variable is an array.
    javascript
    var arr = [1, 2, 3];
var isArray = $.isArray(arr);
// isArray will be true

  3. $.each():

    • Iterates over arrays and objects, executing a function for each element.
    javascript
    $.each([1, 2, 3], function(index, value) {
    console.log(index, value);
});
// Output:
// 0 1
// 1 2
// 2 3

  4. $.extend():

    • Merges the contents of two or more objects together into the first object.
    javascript
    var obj1 = { foo: 1 };
var obj2 = { bar: 2 };
var mergedObj = $.extend({}, obj1, obj2);
// mergedObj will be { foo: 1, bar: 2 }

  5. $.parseJSON():

    • Parses a JSON string into an object.
    javascript
    var jsonStr = '{"name": "John", "age": 30}';
var obj = $.parseJSON(jsonStr);
// obj will be { name: "John", age: 30 }

  6. $.param():

    • Creates a serialized representation of an array or object, suitable for URL query string or Ajax request data.
    javascript
    var data = { name: "John", age: 30 };
var queryString = $.param(data);
// queryString will be "name=John&age=30"

  7. $.isFunction():

    • Checks if a variable is a function.
    javascript
    var func = function() {};
var isFunction = $.isFunction(func);
// isFunction will be true

  8. $.inArray():

    • Searches for a specified value within an array and returns its index (or -1 if not found).
    javascript
    var arr = [1, 2, 3];
var index = $.inArray(2, arr);
// index will be 1

These are just a few examples of jQuery utility functions that can simplify common programming tasks in JavaScript. They provide convenient methods for handling arrays, objects, strings, and other data types.

Thanks for learning