Javascript String lastIndexOf Example | String.Prototype.lastIndexOf()

Javascript String lastIndexOf() is an inbuilt function that returns a position of the last occurrence of a specified value in the string. The string is searched from an end to the beginning, but returns an index starting at the beginning, at position 0. This method returns -1 if a value to search for never occurs. The lastIndexOf() method is case sensitive!

Javascript String lastIndexOf Example

Javascript String lastIndexOf method returns the index within the calling  String object of the last occurrence of the specified value, searching backward from fromIndex. It returns -1 if a value is not found.

The syntax of lastIndexOf() function is following.

#javascript #javascript string lastindexof #js

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Javascript String lastIndexOf Example | String.Prototype.lastIndexOf()

Javascript String lastIndexOf Example | String.Prototype.lastIndexOf()

Javascript String lastIndexOf() is an inbuilt function that returns a position of the last occurrence of a specified value in the string. The string is searched from an end to the beginning, but returns an index starting at the beginning, at position 0. This method returns -1 if a value to search for never occurs. The lastIndexOf() method is case sensitive!

Javascript String lastIndexOf Example

Javascript String lastIndexOf method returns the index within the calling  String object of the last occurrence of the specified value, searching backward from fromIndex. It returns -1 if a value is not found.

The syntax of lastIndexOf() function is following.

#javascript #javascript string lastindexof #js

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JavaScript Strings Tutorial

JavaScript Strings

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Javascript String Slice Example | String.prototype.slice()

JavaScript slice() function extracts parts of a string and returns the extracted parts in a new string. Apply the start and end parameters to specify the part of the string you want to extract. The first character has position 0, the second has position 1, and so on.

Javascript string slice()

Javascript string slice() is an inbuilt function that extracts a part of a string and returns it as the new string without modifying an original string. We can use the startIndex and endIndex parameters to specify the part of the string you want to extract. The first character has position 0; the second has position 1, and so on. You can use the negative number to select from an end of the string.

The changes to the text in one string do not affect the other string.

Syntax

The syntax for the string slice method is the following.

string.slice(startIndex, endIndex)

#javascript #string.prototype.slice #js

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Javascript String Includes Example | String.prototype.includes()

Javascript string includes() is an inbuilt function that determines whether one string may be found within another string, returning true or false as appropriate. With ES6 JavaScript added the includes method natively to both the Array and String natives. While true or false may provide the answer you need, regular expressions can check if a substring exists with a more detailed answer.

Javascript String Includes Example

The string includes() method lets you determine whether or not a  string includes another string. See the following syntax.

str.includes(searchString)

It has only one required parameter which is searchString. It is the substring, which we need to search in the String. See the following example.

// app.js

strA = 'Hello World, Welcome to ES9';

console.log(strA.includes('ES9'));

In the above example, we are checking if the ES9 substring is there inside the strA and if yes then it will return true. In the above example, it is there, so we will see the output true.

#javascript #includes* #string.prototype.includes #js

Javascript String Split Example | String.prototype.split()

Javascript string split() is an inbuilt function that splits the String object into an array of strings by separating a string into substrings, using a specified separator string to determine where to make each split. The string split() function is used to split the given  string into an  array of strings by separating it into substrings using a specified separator provided in the argument.

Javascript string split() method returns a new array. At each match of the separator .split() method will split the string and add the split section as an element to an array.

Javascript string split example

If an empty string (”) is used as the separator, the string is split between each character. The string split() method does not change an original string. The syntax for the split() method is the following.

string.split(separator, limit)

The separator is an optional parameter. The separator specifies a character, or a regular expression, to use for splitting a string. If omitted, then the entire string will be returned.

The limit is an optional parameter. It is an integer that specifies the number of splits, items after the split limit will not be included in the array.

#javascript #string.prototype.split #js