{"id":13213,"date":"2020-06-24T21:20:42","date_gmt":"2020-06-25T04:20:42","guid":{"rendered":"https:\/\/careerkarma.com\/blog\/?p=13213"},"modified":"2023-12-01T03:23:20","modified_gmt":"2023-12-01T11:23:20","slug":"javascript-startswith-endswith","status":"publish","type":"post","link":"https:\/\/careerkarma.com\/blog\/javascript-startswith-endswith\/","title":{"rendered":"JavaScript startsWith and endsWith: A Complete Guide"},"content":{"rendered":"\n

The JavaScript startsWith<\/code> method will return true or false if a string starts with a specified character or string. JavaScript endsWith<\/code> works the same way but applies to the end of a string. Both accept parameters that effect where the methods search.<\/em><\/p>\n\n\n\n

\n\n\n\n

In JavaScript, you may want to determine whether a string starts with or ends with a particular character or set of characters. For instance, if you\u2019re operating a cafe and want to find out whether key lime pie is the most popular flavor, you would want to check if your list of pie flavors ordered by popularity starts with key lime pie.<\/p>\n\n\n\n

The JavaScript startsWith()<\/code> method is used to determine whether a string starts with a particular substring. The endsWith()<\/code> method is used for the same purpose but checks whether a string ends with a specified substring.<\/p>\n\n\n\n

This tutorial will discuss how to use the startsWith()<\/code> and endsWith()<\/code> methods, and walk through an example of each of these functions step-by-step. By the end of this tutorial, you\u2019ll be an expert at using the startsWith()<\/code> and endsWith()<\/code> methods.<\/p>\n\n\n\n

JavaScript startsWith<\/h2>\n\n\n\n

The startsWith()<\/code> method determines whether a string begins with the characters of a specified substring, and returns true or false. The syntax for the startsWith()<\/code> method is as follows:<\/p>\n\n\n\n

string_name.startsWith(substring, position);<\/pre><\/div>\n\n\n\n
The startsWith()<\/code> method accepts two parameters:<\/p>\n\n\n\n
    \n
  • substring<\/strong> is the characters to be searched for at the start of the string object. (required)<\/li>\n\n\n\n
  • position<\/strong> is the position at which the search should begin. (optional)<\/li>\n<\/ul>\n\n\n\n
    startsWith()<\/code> returns a Boolean value\u2014true or false\u2014depending on whether the string starts with the substring you have specified.<\/p>\n\n\n\n
    Let\u2019s go through an example to explain how the startsWith<\/code> method works.<\/p>\n\n\n\n
    Suppose you are operating a cafe and you want to determine whether key lime was the most popular pie sold in your store last month. You remember that a lot of key lime pies were ordered, and if it turns out to be the most popular flavor, you may want to run a new promotion on the pies to attract customers.<\/p>\n\n\n\n
    You could use the startsWith()<\/code> method to check whether key lime was the most popular pie ordered at your store. Here\u2019s an example of a program that accomplishes this task:<\/p>\n\n\n\n
    var pie_rankings = \"Key Lime Apple Blueberry Cherry Strawberry Pecan Peach\";\nconsole.log(pie_rankings.startsWith(\"Key Lime\"));<\/pre><\/div>\n\n\n\n
    When we run our code, the following response is returned: <\/p>\n\n\n\n
    true<\/pre><\/div>\n\n\n\n
    Let\u2019s break down our code. On the first line, we declare a string called pie_rankings<\/code> which stores all the pies we sold last month. The first pie in our list is the most popular, the second pie is the second-most popular, and so on. Then, we use the startsWith()<\/code> method to check if the string begins with Key Lime<\/code>, and we use console.log()<\/code> to print out the response to the console.<\/p>\n\n\n\n
    In this case, our pie_rankings<\/code> string starts with Key Lime<\/code>, and so our program returned true.<\/p>\n\n\n\n
    Now, suppose that we want to figure out whether apple pie was the second-most popular pie ordered last month. We recall that a lot of apple pies were ordered, and if apple was the second-most popular flavor, that next month we could raise the prices slightly.<\/p>\n\n\n\n
    We could use the startsWith()<\/code> method and its optional position<\/code> parameter to determine whether apple pie was the second most popular pie ordered at our cafe.<\/p>\n\n\n\n
    Now, in order for our program to work, we need to know the index value at which Key Lime <\/code> ends (notice there is a space after Key Lime<\/code>, because it is one entry of many in our list of pies). In this case, Key Lime<\/code> lasts 9 characters\u2014seven are letters and two are spaces.<\/p>\n\n\n\n
    So, we know that our search should start at index position 8 in our list. Here\u2019s an example of a program that allows us to check whether our list starts with Apple<\/code> at the index position 9 (which is where the second pie starts in our list):<\/p>\n\n\n\n
    var pie_rankings = \"Key Lime Apple Blueberry Cherry Strawberry Pecan Peach\";\nconsole.log(pie_rankings.startsWith(\"Apple\", 9));<\/pre><\/div>\n\n\n\n
    Our code returns: true. Apple<\/code> starts at the index position 9 in our list, so our code returned true. <\/p>\n\n\n\n
    JavaScript endsWith<\/h2>\n\n\n\n
    endsWith()<\/code> is the opposite of the startsWith()<\/code> method. The endsWith()<\/code> method determines if a string ends with a particular set of characters. Here\u2019s the syntax for the endsWith()<\/code> method:<\/p>\n\n\n\n
    string_name.endsWith(substring, length);<\/pre><\/div>\n\n\n\n
    The endsWith()<\/code> method accepts two parameters:<\/p>\n\n\n\n
      \n
    • substring<\/strong> is the string to search for in the string. (required)<\/li>\n\n\n\n
    • length<\/strong> is the length of the string to search. The default value for this parameter is the length of the string. (optional)<\/li>\n<\/ul>\n\n\n\n
      Let\u2019s explore an example of the endsWith()<\/code> method.<\/p>\n\n\n\n
      Suppose that we are looking to reduce the size of our menu by one pie because the baker who makes the pies is overwhelmed by the number of different pies they have to make. We think that peach pies were the least popular last month, and we want to check that against our list of pies ordered by popularity.<\/p>\n\n\n\n
      We could use the following code to check if our list of pies ends with Peach<\/code>:<\/p>\n\n\n\n
      var pie_rankings = \"Key Lime Apple Blueberry Cherry Strawberry Pecan Peach\";\nconsole.log(pie_rankings.endsWith(\"Peach\"));<\/pre><\/div>\n\n\n\n
      Our code returns: true. As you can see, our pie_rankings<\/code> string ends with Peach<\/code>. So, the endsWith()<\/code> method returns true<\/code>.<\/p>\n\n\n\n
      In addition, we can specify the length<\/code> argument if we want our string to stop searching at a certain index value. For instance, say we wanted to check whether Strawberry<\/code> was the second-least popular pie sold last month.<\/p>\n\n\n\n
      We know that the length of our string is 54, and if we subtract the length of Peach<\/code> from the string, we can get the length of our string minus the last pie. Peach<\/code> is 5 characters long, and if we subtract 5 from 54 we get 49.<\/p>\n\n\n\n
      In addition, there is a space before Peach<\/code> in our string, so we\u2019ll have to subtract another 1 from our string\u2019s length, which means the position at which the second last pie ends in the string is 48.<\/p>\n\n\n\n
      Here\u2019s the code we could use to check whether Strawberry<\/code> is the second-least popular pie in the pie_rankings<\/code> string:<\/p>\n\n\n\n
      var pie_rankings = \"Key Lime Apple Blueberry Cherry Strawberry Pecan Peach\";\nconsole.log(pie_rankings.endsWith(\"Strawberry\", 48));<\/pre><\/div>\n\n\n\n
      Our code returns: false. As you can see, Pecan<\/code> comes at the end of our list before the value Peach<\/code> and Strawberry<\/code> appears before Pecan<\/code> in the list. As a result — Strawberry<\/code> is not the second-last pie on the list — our code returns false<\/code>.<\/p>\n\n\n\n
      Conclusion<\/h2>\n\n\n\n
      The startsWith()<\/code> method is used to determine whether a string starts with a particular sequence of characters. The endsWith()<\/code> method is used to check whether a string starts with a sequence of characters.<\/p>\n\n\n\n
      This tutorial explored how to use the startsWith()<\/code> and endsWith()<\/code> methods in JavaScript, and walked through an example of each of the methods in action. You\u2019re now equipped with the knowledge you need to use the startsWith()<\/code> and endsWith()<\/code> methods like an expert.<\/p>\n","protected":false},"excerpt":{"rendered":"The JavaScript startsWith method will return true or false if a string starts with a specified character or string. JavaScript endsWith works the same way but applies to the end of a string. Both accept parameters that effect where the methods search. In JavaScript, you may want to determine whether a string starts with or…","protected":false},"author":240,"featured_media":13214,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11933],"tags":[],"class_list":{"0":"post-13213","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-javascript"},"acf":{"post_sub_title":"","sprint_id":"","query_class":"JavaScript","school_sft":"","parent_sft":"","school_privacy_policy":"","has_review":"","is_sponser_post":"","is_guest_post":""},"yoast_head":"\nJavaScript startsWith and endsWith: A Complete Guide | Career Karma<\/title>\n<meta name=\"description\" content=\"We use JavaScript startsWith and endsWith methods to check if a string starts with or ends with a substring. 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