The array.join() method will return a new string by concatenating all the elements of the array.
let array = ["I", "Love", "Tamil", "language"];let joinedSting = array.join(","); // join with comma as delimiterconsole.log("After joining array =", joinedSting);
The array method takes a separator as an argument. The separator will be placed between the elements of the array.
let array = ["I", "Love", "Tamil", "language"];console.log("\n-------------\nJoining array with separator ','");let str = array.join(',');console.log(str);console.log("\n-------------\nJoining array with empty space as separator");str = array.join('');console.log(str);console.log("\n-------------\nJoining array with separator ' + ' ");str = array.join(' + ');console.log(str);console.log("\n-------------\nJoining array with space as separator ");str = array.join(' ');console.log(str);
If the array only contains one element, the separator will not be added.
console.log("\n-------------\nIf there is only one element in the array, the seperator will not be added");let array = ["Tamil"];let str = array.join(',');console.log(str);
, is considered as the default separator.
console.log("\nJoining array with empty string as separator ");let array = ["I", "Love", "Tamil", "language"];let str = array.join();console.log(str);
If the length of the array is 0, then the empty string is returned.
console.log("\n-------------\nIf the array length is 0 then empty string is returned");let array = [];let str = array.join('~~~~~~');console.log("value after join empty array",str);
If an element of the array is undefined, null, or an empty array [], it is converted to an empty string.
console.log("If an array element is undefined or null then empty string is returned \n")let array = [1,undefined,2,null,3,4];let str = array.join(",");console.log("After joining array", array, "\nThe returned value is ", str );
All elements are converted to a string before they are joined. If the array contains an object, it is converted to a string as well.
console.log("Joining object ");let array = [{}, [1], "1"];let str = array.join("-");console.log("On joining", array, "\nThe returned sting is", str);
let array = ["I", "Love", "Tamil", "language"];console.log("\n-------------\nJoining array with separator ','");let str = array.join(',');console.log(str);console.log("\n-------------\nJoining array without separator - by default ',' is considered as separator");str = array.join();console.log(str);console.log("\n-------------\nJoining array with separator ' + ' ");str = array.join(' + ');console.log(str);console.log("\nJoining array with empty string as separator ");str = array.join('');console.log(str);console.log("\n-------------\nJoining array with space as separator ");str = array.join(' ');console.log(str);console.log("\n-------------\nIf there is only one element in the array seperator will not be added");array = ["Tamil"];str = array.join(',');console.log(str);console.log("\n-------------\nIf the array length is 0 then empty string is returned");array = [];str = array.join('~~~~~~');console.log(str);console.log("\n-------------\nIf an array element is undefined or null then empty string is returned \n")array = [1,undefined,2,null,3,4];str = array.join(",");console.log("After joining array", array, "\nThe returned value is ", str );console.log("\n-------------\nJoining object ");array = [{}, [1], "1"];str = array.join("-");console.log("On joining", array, "\nThe returned sting is", str);