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Number System Definition, Types, Conversion, Examples, Facts Notably, when converted to integers, both undefined and null become 0, because undefined is converted to NaN, which also becomes 0. number .parseFloat() and Number.parseInt() are similar to Number() but only convert strings, and have slightly different parsing rules. For example, parseInt() doesn't recognize the decimal point, and parseFloat() doesn't recognize the 0x prefix. BigInts throw a TypeError to prevent unintended implicit coercion causing loss of precision. The Number constructor contains constants and methods for working with numbers. When parsing data that has been serialized to JSON, integer values falling outside of this range can be expected to become corrupted when JSON parser coerces them to Number type. Number.prototype.toLocaleString() Returns a string with a language sensitive representation of this number. Number.prototype Allows the addition of properties to the Number object. When used as a f