If not NaN, the return value will be the integer that is the first argument taken as a number in the specified radix. Therefore, if you are looking to convert floating-point numbers to integers or strings to integers, the most convenient and straightforward way may in fact be ES6’s new unc() function. The parseInt function converts its first argument to a string, parses that string, then returns an integer or NaN. If you have looked through the results above on a modern browser (one implementing unc()) you’ll notice that for all of our test cases, it is the only solution that works for them all. Resultsīelow are the results of using your browser to test out each solution: We can use the newer unc() function which should in theory just do what we want □. Finally we can prefix this expression with a plus sign ( +) to convert the string to a number again. Normally, you will not use it in your own code. The toString () method is used internally by JavaScript when an object needs to be displayed as a text (like in HTML), or when an object needs to be used as a string. After that we can use () to make the number a string representation of the truncated number. Every JavaScript object has a toString () method. We can also use the equivalent function to parseInt() for floats which is parseFloat(). Solution #3: +parseFloat(x, 10).toFixed(0) parseInt('010') produces 8 in older versions of ECMAScript). We can use this function and specify the base to ensure that numbers starting with 0 will not be parsed as octals (eg. num parseInt (num) Do this for each of your string numbers before adding them and everything should work. If you do not choose a radix it will default to 10 which was the correct value to use here. The Number() method lets us convert the string into a number. var num '1,700.00' num num.replace (/\,/g,'') This will return a string with a number in it. There is actually a function that will convert strings into numbers called parseInt(). The Number() Method for converting a string to an integer. If you want to convert the array back to a string use join () ( MDN) and for converting a string to an integer use parseInt () ( MDN ). If the number is outside of that range it will be converted to a number within that range (eg. The reason we can only use this solution for smaller numbers is because bit-wise operations can only be executed on a number in the range of -(2 31) to 2 31 - 1. If we are dealing with smaller number then we can leverage bit-wise operators such as bit-wise negation ( ~). In this post we will examine four different ways and then we will see which is the best in all cases. There are various ways to convert a string or a floating point number to an integer in JavaScript, but not all of them may suit your needs.
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