String # codePointAt or String # charCodeAt?

The difference is simple. First, a String value (more expressed as "string") stores a sequence of nonnegative integers, the size of 2 bytes (16 bits), called "elements" for easy reference.

The String#charCodeAt(índice) method, for example, only returns the value of the element in the index (which by convention starts from 0 ) specified as a number. The static method String.fromCharCode(...códigos) returns a value of type String, where each element equals each given code.

Now, difference from String#codePointAt(índice) . Based on UTF-16 encoding, returns the given character code in the given index (index of elements, not of code).

The static method also differs from% w / w% because of UTF-16 encoding (it creates two elements if you need surrogate pairs to represent the one-character code), but it does not give exceptions for codes between String.fromCodePoint(...códigos) and String.fromCharCode() should).

From the documentation:

String.fromCodePoint()

  

The static String.fromCodePoint () method returns a string created using the specified string of code points

String.prototype.codePointAt()

  

The codePointAt () method returns a nonnegative integer that is the code   Unicode of the code point

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