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I think my problm is quite simple, but I don't think I've found a way to make it work.

My goal is to : let winX = ['X', 'X', 'X']

I tried doing this with :

 let winX = [ function () { for (let index = 0;index < cells_in_line;index++) { winX.push('X'); } return winX; } ];

But a call to the console says it's undefined.

Is there a way to generate an array depending on certain variables with a function expression and a loop?

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You can use Array#fill for primitive values and Array.from for objects.

// For primitives: let winX = Array(3).fill('X'); console.log(winX); // For objects: let arr = Array.from({length: 3}, _=>({x: 1})); console.log(arr); console.log(arr[0] !== arr[1], arr[1] !== arr[2]);

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Related: Array.prototype.fill() with object passes reference and not new instance.

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