#CONVERT STRING TO INTEGER JAVASCRIPT CODE#
While concise and effective, this isn't a very well-known feature of JavaScript, so it's not advised to use since it may make your code not as easy to understand. Unary OperatorĪs with Concatenating an Empty String, there is also a workaround that has better performance but lacks readability. Keep in mind that if you're needing to parse floats then both Math.floor and Math.ceil are probably not good options since they'll always convert the strings to the nearest integer equivalent. Math.ceil(str) // 100 Math.ceil(fltStr) // 101 Math.ceil(nanStr) // NaN
The method can accept Strings, also making it a way to convert a String to a number: let str = '100' Very similar to the previous method, Though, this time it returns the nearest integer rounded up. Math.floor(str) // 100 Math.floor(fltStr) // 99 Math.floor(nanStr) // NaN Math.ceil() Surprisingly, this method can also accept Strings, making it yet a way to convert a String to an integer. ParseFloat(str) // 353 parseFloat(fltStr) // 353.21 parseFloat(nanStr) // NaN Math.floor() ParseInt(str) // 353 parseInt(fltStr) // 353 parseInt(binStr, 2) // 111 (Binary) parseInt(nanStr) // NaN (Not a Number). 0x - If the prefix is 0x, then the radix is 16 (hexadecimal).Īlthough, we can simply add an optional argument to the method call, defining the base: let str = '353'.0 - If the prefix is 0, then the radix is 8 (octal).No prefix - If there isn't a prefix, the radix is 10 (decimal).The base can be defined by adding prefixes to the numbers we want to parse: If a String is multiplied by the primitive number 1, the string will become a number. Unary Operator By adding a + sign before a String, it will be converted into a number if it follows the right format.Math.ceil() can be used to round an integer or floating point number.It returns the nearest integer rounded down. Math.floor() is used to round an integer or floating point number.parseFloat() takes a String as an argument, and returns the Float point number equivalent. parseInt() takes a String as a first argument, and a base to which that String will be converted to. These are parseInt(), parseFloat(), Math.floor(), Math.ceil(), Unary Operator / Multiply by 1. Converting String to NumberĪs with the previous shown methods, JavaScript also provides functions to easily transform a String to a primitive number. The same goes for the other way around, converting a String to a number. Converting a Number to a String is a common and simple operation. Managing data is one of the fundamental concepts of programming.
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