TypeScript | Array join() Method

The Array.join() is an inbuilt TypeScript function which is used to joins all the elements of an array into a string. 
Syntax:

array.join(separator)

Parameter: This method accept a single parameter as mentioned above and described below:

  • separator : This parameter is the a string to separate each element of the array.

Return Value: This method returns the string after joining all the array elements. 
Below examples illustrate the Array join() method in TypeScript.

Example 1: 

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<script>
    // Driver code
    var arr = [ 11, 89, 23, 7, 98 ]; 
  
    // use of join() method 
    var str = arr.join(", ")
       
    // printing element
    console.log("String : " + str);
</script>

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Output: 

String : 11, 89, 23, 7, 98

Example 2: 

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<script>
    // Driver code
    var arr = [ 'a','b','c','a','e' ]; 
  
    // use of join() method 
    var val = arr.join(" ")
    var val1 = arr.join(" + ")
       
    // printing element
    console.log(val);
    console.log(val1);
</script>

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Output: 

a b c a e
a + b + c + a + e

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