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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.
Learn how to format a number with two decimals in JavaScript. Format a Number with Two Decimals. You can use the toFixed() method to format a number to only show two decimals. Note that the result is rounded (shows 5.57 instead of 5.56): Example. let num = 5.56789; let n = num.toFixed(2); // 5.57. Try it Yourself »
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
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.
toFixed() returns a string, with the number written with a specified number of decimals: Example. var x = 9.656; x.toFixed(0); // returns 10. x.toFixed(2); // returns 9.66. x.toFixed(4); // returns 9.6560. x.toFixed(6); // returns 9.656000. Try it yourself » toFixed(2) is perfect for working with money. The toPrecision () Method.
JavaScript numbers can be written with, or without decimals. The typeof() function in JavaScript cannot be used to find the data type of a variable or a value. Extra large or extra small numbers can be written with scientific (exponential) notation in JavaScript.
