JavaScript: Array.prototype.join

By Xah Lee. Date: . Last updated: .
arrayX.join()
Join array elements to string, using comma ",".
console.log([3, 4, 5].join() === "3,4,5");

Nested array are flattened:

// example of join nested array
console.log([3, 4, [3, 4]].join() === "3,4,3,4");

array containing data objects:

// array containing data objects
const xx = [3, { k: 4 }];
console.log(xx.join() === "3,[object Object]");
arrayX.join(seperatorString)
Use seperatorString between elements.
console.log([3, 4, 5].join("-") === "3-4-5");

Array to String

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