How to loop an array inside another array in Javascript?

Question

Given this script

<script>
var sentences= 
[
 ['journey27.mp4', 
  [
    [1, 2],
    [5, 7]
  ]
 ],
 ['journey28.mp4', 
  [
    [10, 12],
    [13, 17],
    [25, 36]
  ]
 ],
 ['journey30.mp4', 
  [
    [13, 15],
    [15, 19]
  ]
 ]
];

function playVideo(myUrl, startTime, endTime) { 
  console.log(`Playing ${myUrl} from ${startTime} to ${endTime}`);
} 
function myLoop(){
//what should I fill in here?
}
</script>

I want to print out this result:

Playing 'journey27.mp4' from 1 to 2
Playing 'journey27.mp4' from 1 to 2
Playing 'journey27.mp4' from 1 to 2

Playing 'journey27.mp4' from 5 to 7
Playing 'journey27.mp4' from 5 to 7
Playing 'journey27.mp4' from 5 to 7

Playing 'journey28.mp4' from 10 to 12
Playing 'journey28.mp4' from 10 to 12
Playing 'journey28.mp4' from 10 to 12

Playing 'journey28.mp4' from 13 to 17
Playing 'journey28.mp4' from 13 to 17
Playing 'journey28.mp4' from 13 to 17

Playing 'journey28.mp4' from 25 to 36
Playing 'journey28.mp4' from 25 to 36
Playing 'journey28.mp4' from 25 to 36

Playing 'journey30.mp4' from 13 to 15
Playing 'journey30.mp4' from 13 to 15
Playing 'journey30.mp4' from 13 to 15

Playing 'journey30.mp4' from 15 to 19
Playing 'journey30.mp4' from 15 to 19
Playing 'journey30.mp4' from 15 to 19

Note: each line of the subarray should be played 3 times then it moves to the next line.

How can I fill in myLoop function to print out the above result?

Nick Vu · Accepted Answer · 2022-08-16 00:57:59Z

1

You can try this approach

var data = [
  ['journey27.mp4',
    [
      [1, 2],
      [5, 7]
    ]
  ],
  ['journey28.mp4',
    [
      [10, 12],
      [13, 17],
      [25, 36]
    ]
  ],
  ['journey30.mp4',
    [
      [13, 15],
      [15, 19]
    ]
  ]
];

function playVideo(myUrl, startTime, endTime) {
  console.log(`Playing ${myUrl} from ${startTime} to ${endTime}`);
}

function myLoop(sentences, lineCount) {
  for (const sentence of sentences) {
    const [video, timers] = sentence //extract video url and the timer array
    for (const timer of timers) {
      const [startTime, endTime] = timer //extract start time and end time in each timer
      for (let i = 0; i < lineCount; i++) {
        playVideo(video, startTime, endTime) //console.log for each line
      }
    }
  }
}

const lineCount = 3 //will print 3 times
myLoop(data, lineCount)

answered Aug 16, 2022 at 0:57

Nick Vu

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1 Comment

Nick Vu Over a year ago

It's not my question though, I just helped to format the question :D @Déjàvu

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