I have an array containing strings with prices and sometimes surrounded by characters.
How do I transform it from?
[0] > '$9.99/aa'
[1] > '$2.99'
[2] > '$1.'
to:
[0] > '9.99'
[1] > '2.99'
[2] > '1'
So I can do comparisons with the values? I just need to know how to change one and I can apply it to the array easily
+myString.replace(/[^\d.ex-]+/gi, '')
strips out all characters that cannot appear in a JavaScript number, and then applies the + operator to it to convert it to a number. If you don't have numbers in hex format or exponential format then you can do without the ex.
EDIT:
To handle locales, and handle numbers in a more tailored way, I would do the following
// Get rid of myriad separators and normalize the fraction separator.
if ((0.5).toLocaleString().indexOf(',') >= 0) {
myString = myString.replace(/\./g, '').replace(/,/g, '.');
} else {
myString = myString.replace(/,/g, '');
}
var numericValue = +(myString.match(
// Matches JavaScript number literals excluding octal.
/[+-]?(?:(?:(?:0|[1-9]\d*)(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?|0x[0-9a-f]+)/i)
// Will produce NaN if there's no match.
|| NaN);
0.5.toLocaleString() to normalize fraction separators and myriad separators before converting to a number.Your case requires a Regular Expression, because all native number-converting methods fail when the string is prefixed by a non-digit/dot.
var string = '$1.22'; //Example
string = string.replace(/[^0-9.]+/g, '');
// string = '1.22'
If you want to convert this string to a digit, afterwards, you can use parseInt, +, 1*.
For a comparison of these number-converting methods, see this answer
parseFloat() works for such cases when you need the decimals. The regex will give the matched number for all your cases in the 0 index. Sample code is below.
var one = "2.99";
var two = '$1.';
var three = '$3tees';
var four = '$44.10'
var regex = /\d+\.?(\d+)?/;
var num = parseFloat(one.match(regex)[0]);
Strip everything before the first digit and apply parseFloat to the rest:
s = "$9.99/aa"
alert(parseFloat(s.replace(/^\D*/, '')))
+/[\d\.]+/.exec('$9.99/aa')[0]
Finds the first group of digits and periods, converting them to a float
The lazy way:
+string;
The proper way:
parseInt(string, 10);
Thus:
for (var i = 0; i < arr.length; i++) {
var match = /\$(\d*)\.(\d\d)/.exec(arr[i]);
arr[i] = parseInt(match[1] + match[2]);
}
Edit: Oh, you wanted something more than 10 dollars.
Another edit: Apparently parseInt (at least in my browser) ignores trailing characters. In that case, my original implementation would have worked.
for (var i = 0; i < arr.length; i++) {
arr[i] = parseInt(arr[i].substring(1));
}
