There are two main ways to convert a string to a number in JavaScript. One way is to parse it and the other way is to change its type to a Number. All of the tricks in the other answers (e.g., …

If someone wants to know if a string contains a number, it seems to me that they would want to know if it contains a number, and 1e+30 is a number. Certainly if I were testing a string for a …

Here are some things you might see that take advantage of the way JavaScript deals with strings and numbers. Personally, I wish JavaScript had used some symbol other than + for string …

Aug 20, 2009 · Does anyone know how can I check whether a variable is a number or a string in JavaScript?

According to this benchmark it's the fastest way to convert a Number to String in Firefox 58 even though it's slower than " + num in the popular browser Google Chrome.

Mar 23, 2016 · Yes it gets a boolean from the < result and coerces it to string, but by then it's too late to affect how the comparison worked. JS < operator behavior depends on its two …

Here's another interesting, readable way to check if a string contains only digits. This method works by splitting the string into an array using the spread operator, and then uses the every() …

Nov 29, 2016 · In JavaScript, the + operator is used for both numeric addition and string concatenation. When you "add" a number to a string the interpreter converts your number to a …

Is there any way to convert a variable from string to number? For example, I have var str = "1"; Can I change it to var str = 1;

Apr 9, 2012 · } When you initialize an array with a number, it creates an array with the length set to that value so that the array appears to contain that many undefined elements. Though some …