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These number methods can be used on all JavaScript numbers: Method. Description. toString () Returns a number as a string. toExponential () Returns a number written in exponential notation. toFixed () Returns a number written with a number of decimals.
By default, JavaScript displays numbers as base 10 decimals. But you can use the toString() method to output numbers from base 2 to base 36. Hexadecimal is base 16. Decimal is base 10. Octal is base 8. Binary is base 2.
JavaScript Numbers. JavaScript has only one type of number. Numbers can be written with, or without, decimals:
24 lip 2016 · Using Number.isInteger(num) can help check what would count as whole number and what would not. For example: let num1 = 6.0000000000000001; // 16 decimal places let num2 = 6.000000000000001; // 15 decimal places Number.isInteger(num1); // true, because of loss of precision // while: Number.isInteger(num2); // false
Number values represent floating-point numbers like 37 or -9.25. The Number constructor contains constants and methods for working with numbers. Values of other types can be converted to numbers using the Number() function.
JavaScript numbers can be formatted in different ways like commas, currency, etc. You can use the toFixed () method to format the number with decimal points, and the toLocaleString () method to format the number with commas and Intl.NumberFormat () method to format the number with currency.
Introduction to JavaScript Numbers. Understanding Number Types. Writing Numbers in JavaScript. Hexadecimal, Binary, and Octal Numbers. The toString Method. Rounding Methods. Handling Imprecise Calculations. Special Numeric Values. Numeric Conversion: parseInt and parseFloat. Conclusion. Practice Your Knowledge new. Related Resources.
