JavaScript 1.5 version: Deprecated Featuresess validation

Last update on May 28 2022 10:32:30 (UTC/GMT +8 hours)

RegExp (Regular expression) Properties

The following properties are deprecated.

Property	Description
$1, ..., $9	Parenthesized substring matches, if any.
$_	The string against which a regular expression is matched.
$*	Reflects whether or not to search in strings across multiple lines.
$&	The last matched characters.
$+	The last parenthesized substring match.
$`	The substring preceding the most recent match
$'	The substring following the most recent match
input	The string against which a regular expression is matched.
lastMatch	The last matched characters.
lastParen	The last parenthesized substring match, if any.
leftContext	The substring preceding the most recent match.
rightContext	The substring following the most recent match.

RegExp (Regular expression) Methods

The compile method is deprecated.

The valueOf method is no longer specialized for RegExp. Use Object.valueOf.

Escape sequences

Octal escape sequences (\ followed by one, two, or three octal digits) are deprecated in string and regular expression literals.

The escape and unescape functions are deprecated. Use encodeURI, encodeURIComponent, decodeURI or decodeURIComponent to encode and decode escape sequences for special characters.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04