Question

8

Calling splice inside map function

rated 0 times [ 11] [ 3] / answers: 1 / hits: 18172 / 10 Years ago, wed, april 30, 2014, 12:00:00

I have following code:

var a = [{a: 1}, {a: 2}, {a: 3}];

a.map(function (item, index) {

  console.log('call');

  if (index < 1) {

    a.splice(index, 1);

  }

});

But call is printed only two times, and I expect to be printed three times. I know that splice has messed up array, but is there some workaround for this behaviour?

Thank you!

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makaylahk

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4 Years ago

answered 10 Years ago agustindejonm · Accepted Answer

Make a shallow copy of the array:

a.slice().map(function (item, index) {

By the way, you should maybe use forEach since you're not returning any value.

Or even better, have you considered using filter instead?

var a = [{a: 1}, {a: 2}, {a: 3}].filter(function (item, index) {

  console.log('call');

  return index >= 1;

});