Number.prototype.toFixed() vs Number.prototype.toExponential()
Number.prototype.toFixed() and Number.prototype.toExponential() are both JavaScript Number APIs, and choosing between them is a common point of confusion. This page compares their syntax, parameters, return values, and typical use cases so you can pick the right one. Number.prototype.toFixed(): Formats a number using fixed-point notation. Its syntax is num.toFixed(digits), and it returns a string representing the number. Number.prototype.toExponential(): Returns a string in exponential notation. Its syntax is num.toExponential(fractionDigits). Example of Number.prototype.toFixed(): (1.234).toFixed(2) // "1.23". Example of Number.prototype.toExponential(): (1234).toExponential(2) // "1.23e+3". Read the full references for Number.prototype.toFixed() and Number.prototype.toExponential() to see edge cases, time complexity, browser support, and the mistakes developers most often make with each. Other Number APIs worth comparing: Number.prototype.toPrecision(), Number.prototype.toString(), Number.isNaN(), Number.isFinite(), Number.isInteger(), Number.isSafeInteger(). Both belong to the Number category in the JS Reference documentation, which covers 18 entries in total. Try both in the JavaScript playground to see the behavioral difference live.