How to traverse an array by skipping some indices?

Question

How to traverse an array by skipping some indices?

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#1 by (8 votes)
#2 by (3 votes)

3

Is there a native way of doing this?

for (var i in vetor) {
    for (var j in vetor) {
        if (i == j) {
            // pula o i
            break;
        }
    }
}

Is there any way to skip i within the parentheses of the second for?

javascript array

asked by anonymous 08.09.2017 / 16:26

2 answers

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score 8 · Answer 1

Yes, there is. Just use continue . In this case, how you want to interact with the outermost loop , you must specify a label for it and use it next to continue . The label can be specified with an identifier before for , followed by colon ( : ).

const vetor = [1, 2, 3, 4, 5];

loop_i: for (let i = 0; i < vetor.length; i++) {
    loop_j: for (let j = 0; j < vetor.length; j++) {
        if (i == j) continue loop_i;
        console.log("i:", i, "j:", j);
    }
}

Note that in the example the value of j is only traversed to the current value of i .

score 3 · Answer 2

It should be something like this:

for (var i = 0; i < vetor.length; i++) {
    for (var j = 0; j < vetor.length; j++) {
        if (vetor[i] == vetor[j]) {
            i++;
            break;
        }
    }
}

By traversing the vector through the index you have full control of how it is being incremented since it is a variable like any other.