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Can anyone tell me the exact difference between join() and toString() and valueOf()in Javascript. When and at what situation we need to use them?
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If the hint is String , then toString is used before valueOf . But, if the hint is Number , then valueOf will be used first. Note that if only one is present, or it returns a non-primitive, it will usually call the other as the second choice.
toString() method when called on a number is the opposite of parseInt, meaning it converts the decimal to any number system between 2 and 36.
The toString() method returns a string as a string. The toString() method does not change the original string. The toString() method can be used to convert a string object into a string.
toString() The toString() method returns a string representing the specified array and its elements.
toString is a method that you can find not only in Arrays, but in every object.
join allows you to convert every element of the Array object in to a string, and joining together using a separator. It behaves just like toString for Arrays, but you can also specify the separator:
var classes = ["first", "second"];
classes.join(" "); // "first second"
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