How can I compare arbitrary version numbers?

Question

Does anyone have code to compare two version numbers in JavaScript? I just want simple version comparisons (e.g. \"1.0\" vs \"1.5.6\"), and it shou

Answer 1

If you do not care about the .5.6, use parseInt

var majorV = parseInt("1.5.6",10)

Since you said you care about the minor versions:

function cmpVersion(v1, v2) {
    if(v1===v2) return 0;
    var a1 = v1.toString().split(".");
    var a2 = v2.toString().split(".");
    for( var i = 0; i < a1.length && i < a2.length; i++ ) {
        var diff = parseInt(a1[i],10) - parseInt(a2[i],10);
        if( diff>0 ) {
            return 1;
        }
        else if( diff<0 ) {
            return -1;
        }
    }
    diff = a1.length - a2.length;
    return (diff>0) ? 1 : (diff<0) ? -1 : 0;
}

console.log( cmpVersion( "1.0", "1.56") );
console.log( cmpVersion( "1.56", "1.56") );
console.log( cmpVersion( "1.65", "1.5.6") );
console.log( cmpVersion( "1.0", "1.5.6b3") );