diviser 2 tableaux javascript
const your_array = ['a','b','c','d','e','f']
const thread1Length = Math.floor(your_array.length/2)
const thread2Length = your_array.length-thread1Length
const thread1 = your_array.slice(0,thread1Length)
const thread2 = your_array.slice(thread1Length,your_array.length)
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