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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
At least the last 4 tests are inversed.
My solution returns false when length > 1 and it works, but the tests say they expect true.You need to change the text of tests.
String.prototype.digit = function() {
if(this.length > 1){
return false
}
return (parseInt(this) < 10 && parseInt(this) >= 0)
}