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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;
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You can convert a string to a number in Node. js using any of these three methods: Number() , parseInt() , or parseFloat() .
Converting strings to numbers is extremely common. The easiest and fastest (jsPerf) way to achieve that would be using the + (plus) operator. You can also use the - (minus) operator which type-converts the value into number but also negates it.
The global method Number () can convert strings to numbers. Strings containing numbers (like "3.14") convert to numbers (like 3.14). Empty strings convert to 0. Anything else converts to NaN (Not a Number). In the chapter Number Methods, you will find more methods that can be used to convert strings to numbers:
Number () can be used to convert JavaScript variables to numbers. We can use it to convert the string too number. If the value cannot be converted to a number, NaN is returned. Number ("10"); // returns 10 Number (" 10 "); // returns 10 Number ("10.33"); // returns 10.33 3. Using Unary Operator (+)
Numbers in JavaScript are a primitive data type – just like strings. Unlike other programming languages, you do not need to specify the type of number you want to create. For example, you do not need to mention whether the number will be an integer or a float.
You can also use unary (+) operator convert string into integer.Its simplest and easy for data manipulation.A unary operator works on one value. The JavaScript has unary plus (+), unary minus (-), prefix / postfix increments (++), prefix / postfix decrements (–) operator.
There are three ways to do this:
str = parseInt(str, 10); // 10 as the radix sets parseInt to expect decimals
or
str = Number(str); // this does not support octals
or
str = +str; // the + operator causes the parser to convert using Number
Choose wisely :)
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