[Solved] Array[key].push Is Not Defined in JavaScript [closed]

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If you need a 2d array, you have to initialize each element of the outer array to be an array.

// Have to check every array item, if it's not an array already, make it so
for(...) {
    if (!data[key]) {
        data[key] = [];
    }
    data[key].push(item[i]);
}

You could always do the following if you know the number of inner arrays you need:

var data = [[],[],[],[],[],[]];

In your example, since they variable name is key, I’m assuming you actually want an object of arrays. If you know the keys ahead of time, you can use the following literal.

var data = {
  myKey1: [],
  myKey2: []
}

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solved Array[key].push Is Not Defined in JavaScript [closed]