Javascript - number conversion
Javascript have three functions for converting nonnumberic value to numbers:
- Number();
- parseInt();
- parseFloat();
Empty string:
Number("") = 0
parseInt("") = NaN
parseFloat("") = NaN
Parsing with first lending a letter:
Number("a1") = NaN
parseInt("a1") = NaN
parseFloat("a1") = NaN
Parsing with first lending 1 number:
Number("1a") = NaN
parseInt("1a") = 1
parseFloat("1a") = 1
Parsing hexadecimal (10):
Number("0xA") = 10
parseInt("0xA") = 10
parseFloat("0xA") = 0
Lending zeros are ignored:
parseFloat("001") = 1
parseInt("001") = 1
Number("001") = 1
Parsing floating numbers with lending zeros:
parseFloat("00.1") = 0.1
parseInt("00.1") = 0
Number("00.1") = 0.1
Parsing floating numbers without lending zeros:
parseFloat("0.1") = 0.1
parseInt("0.1") = 0
Number("0.1") = 0.1
Parsing booleans:
Number(true) = 1
Number(false) = 0
parseFloat(true) = NaN
parseFloat(false) = NaN
parseInt(true) = NaN
parseInt(false) = NaN
Parsing null:
Number(null) = 0
parseFloat(null) = NaN
parseInt(null) = NaN
Parsing undefined:
Number(undefined) = NaN
parseFloat(undefined) = NaN
parseInt(undefined) = NaN
Parsing NaN:
Number(NaN) = NaN
parseFloat(NaN) = NaN
parseInt(NaN) = NaN
Parsing positive negative floating numbers:
parseFloat("+1.1") = 1.1
parseFloat("-1.1") = -1.1
parseInt("+1.1") = 1
parseInt("-1.1") = -1
Number("+1.1") = 1.1
Number("-1.1") = -1.1
Wightespace is ignored:
parseInt(" +1") = 1
parseInt(" -1") = -1
parseFloat(" +1") = 1
parseFloat(" -1") = -1
Number(" +1") = 1
Number(" -1") = -1
parseInt suport radix or base:
parseInt("10",2) = 2 //binary
parseInt("10",8) = 8 //octal
parseInt("10",10) = 10 //decimal
parseInt("10",16) = 16 //hexadecimal
All test cases are hire:
http://jsfiddle.net/zbL7H/3/
Written by Igor Ivanovic
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