Number.prototype.toExponential() vs Number.prototype.toPrecision()
Number.prototype.toExponential() and Number.prototype.toPrecision() 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.toExponential(): Returns a string in exponential notation. Its syntax is num.toExponential(fractionDigits). Number.prototype.toPrecision(): Returns a string with specified precision. Its syntax is num.toPrecision(precision). Example of Number.prototype.toExponential(): (1234).toExponential(2) // "1.23e+3". Example of Number.prototype.toPrecision(): (1.234).toPrecision(2) // "1.2". Read the full references for Number.prototype.toExponential() and Number.prototype.toPrecision() to see edge cases, time complexity, browser support, and the mistakes developers most often make with each. Other Number APIs worth comparing: Number.prototype.toFixed(), 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.