How to convert strings to numbers with vanilla JS
Grammar and types - JavaScript - MDN Web Docs - Mozilla
Converting strings to numbers ... In the case that a value representing a number is in memory as a string, there are methods for conversion.
String.prototype.slice() - JavaScript - MDN Web Docs
If indexStart is omitted, undefined, or cannot be converted to a number, it's treated as 0 . If indexEnd is omitted or undefined, or if ...
String.prototype.match() - JavaScript - MDN Web Docs
A non-RegExp as the parameter. When the regexp parameter is a string or a number, it is implicitly converted to a RegExp by using new RegExp ...
Array.from() - JavaScript - MDN Web Docs
To convert an ordinary object that's not iterable or array-like to an array (by enumerating its property keys, values, or both), use Object ...
eval() - JavaScript - MDN Web Docs - Mozilla
The eval() function evaluates JavaScript code represented as a string and returns its completion value. The source is parsed as a script.
Window: setTimeout() method - Web APIs | MDN
Therefore, don't use strings for the delay value but instead always use numbers: js. Copy to Clipboard. setTimeout(() => { console.log ...
Array.prototype.join() - JavaScript - MDN Web Docs
The string conversions of all array elements are joined into one string. If an element is undefined or null , it is converted to an empty string ...
Intl.NumberFormat - JavaScript - MDN Web Docs
Returns an Array of objects representing the range of number strings in parts that can be used for custom locale-aware formatting. Intl ...
Regular expressions - JavaScript - MDN Web Docs
TypeError: can't convert BigInt to number · TypeError: can't convert x ... Uses a regular expression or a fixed string to break a string into an ...
String.prototype.substring() - JavaScript - MDN Web Docs
See the slice() page for more examples with negative numbers. Replacing a substring within a string. The following example replaces a substring ...
JavaScript - MDN Web Docs - Mozilla
TypeError: can't convert BigInt to number ... ", along with discussing key JavaScript features such as variables, strings, numbers, and arrays.
Date - JavaScript - MDN Web Docs - Mozilla
Returns the numeric value corresponding to the current time—the number of milliseconds since January 1, 1970 00:00:00 UTC, with leap seconds ignored. Date.parse ...
String.prototype.substr() - JavaScript - MDN Web Docs
The substr() method of String values returns a portion of this string, starting at the specified index and extending for a given number of ...
Math.floor() - JavaScript - MDN Web Docs
It does so by multiplying the number by a power of 10, then rounding the result to the nearest integer, then dividing by the power of 10. To ...
Element: innerHTML property - Web APIs - MDN Web Docs - Mozilla
The resulting string is returned. js. Copy to Clipboard. let contents ... converting the HTML into raw text. This is then wrapped in a ...
switch - JavaScript - MDN Web Docs - Mozilla
TypeError: can't convert BigInt to number ... In JavaScript, you can even mix in definitions of strings into these case statements as well.
typeof - JavaScript - MDN Web Docs - Mozilla
The typeof operator returns a string indicating the type of the operand's value ... convert values based on if they're truthy or falsy typeof !!1 ...
Intl - JavaScript - MDN Web Docs - Mozilla
The ECMAScript Internationalization API, which provides language sensitive string comparison, number formatting, date and time formatting, and more.
Math - JavaScript - MDN Web Docs
Returns the integer portion of the input, removing any fractional digits. Examples. Converting between degrees and radians. The trigonometric ...
Array.prototype.concat() - JavaScript - MDN Web Docs
The concat() method of Array instances is used to merge two or more arrays. This method does not change the existing arrays, ...