Can any one help tell me what's wrong with my Javascript code?
var a = ["zero", "one", "two", "three"];
for (var i in a) {
var sliced = a.slice(i + 1);
console.log(sliced);
}the console log gives: ["one", "two", "three"],[],[],[]
but what I expected is: ["one", "two", "three"],["two", "three"],["three"],[]
So, why my code not work? And how should I code? Thanks a lot.
You need to parse the string to number since for...in statement fetches object property which would be string. So in the second iteration, it would try to do a.slice('11')(string cocatenation '1' + 1 ==> '11') which returns an empty array.
var a = ["zero", "one", "two", "three"];
for (var i in a) {
var sliced = a.slice(Number(i) + 1);
console.log(sliced);
}Since it's an array it's better to use a for loop with a counter variable i which starts from 1.
var a = ["zero", "one", "two", "three"];
for (var i = 1; i < a.length; i++) {
var sliced = a.slice(i);
console.log(sliced);
}
Use for loop to iterate arrays
var a = ["zero", "one", "two", "three"];
for (var i = 0; i < a.length; i++) {
var sliced = a.slice(i + 1);
console.log(sliced);
}
This will solve the problem :
why were you trying to do
i+1?
var a = ["zero", "one", "two", "three"];
for (var i in a) {
var sliced = a.slice(i);
console.log(sliced);
}
i+1var a = ["zero", "one", "two", "three"];
var i = 0;
while (i = a.length) {
console.log(a);
a.shift();
}
for..inloop?i + 1to confirm it’s really1,2,3, etc.for..inis always a string.for..in, where current element of iterable property is a string, not a number?