JavaScript Array some() Method

Below is the example of Array some() method.

• Example:
  filter_none

  edit
  close

  play_arrow

  link
  brightness_4
  code

  <script>     function checkAvailability(arr, val) {         return arr.some(function (arrVal) {             return val === arrVal;         });     }     function func() {         // Original function         var arr = [2, 5, 8, 1, 4];            // Checking for condition         document.write(checkAvailability(arr, 2));         document.write("<br>");         document.write(checkAvailability(arr, 87));     }     func(); </script>

  chevron_right

  filter_none

• Output:

  true
  false
  

The arr.some() method checks whether at least one of the elements of the array satisfies the condition checked by the argument method.

Syntax:

arr.every(callback(element[, index[, array]])[, thisArg])

Parameters: This method accepts five parameters as mentioned above and described below:

• callback: This parameter holds the function to be called for each element of the array.
• element: The parameter holds the value of the elements being processed currently.
• index: This parameter is optional, it holds the index of the currentValue element in the array starting from 0.
• array: This parameter is optional, it holds the complete array on which Array.every is called.
• thisArg: This parameter is optional, it holds the context to be passed as this to be used while executing the callback function. If the context is passed, it will be used like this for each invocation of the callback function, otherwise undefined is used as default.

Return value: This method returns true even if one of the elements of the array satisfies the condition(and does not check the remaining values) implemented by the argument method. If no element of the array satisfies the condition then it returns false.

Below Examples illustrate the method in JavaScript:

• Example 1: In this example the method some() checks for any number that is greater than 5. Since there exists element that satisfy this condition, thus the method returns true.

  function isGreaterThan5(element, index, array) 
  {
    return element > 5;
  }
  
  print([2, 5, 8, 1, 4].some(isGreaterThan5));
  

  Output:

  true
  

• Example 2: In this example the method some() checks for any number that is greater than 5. Since there exists no elements that satisfy this condition, thus the method returns false.

  function isGreaterThan5(element, index, array) 
  {
    return element > 5;
  }
  
  print([-2, 5, 3, 1, 4].some(isGreaterThan5)); 
  

  Output:

  false
  

• Example 3: In this example the method some() checks for 2 and 87 in the array. Since only 2 is available therefore the method returns true for first query while it returns false for second query.

  var arr = [2, 5, 8, 1, 4]
  
  function checkAvailability(arr, val) 
  {
    return arr.some(
             function(arrVal) 
             {
               return val === arrVal;
             } );
  }
  
  print(checkAvailability(arr, 2));
  print(checkAvailability(arr, 87));
  

  Output:

  true
  false
  

Codes for the above method are provided below:

Program 1:

Output:

true

Program 2:

Output:

false

Supported Browsers: The browsers supported by JavaScript Array some() method are listed below:

• Google Chrome
• Internet Explorer
• Mozila Firefox
• Safari
• Opera

HGaur

Check out this Author's contributed articles.