Use conditional inside filter() in vuejs?

Question

I would like ot use conditional inside a filter() function in vuejs, but i got an error after || if

This is my code :

return this.produits.filter((item) => {
  return (
    item.codeproduct == this.codebar ||
    if (item.produitbrand) {
      for (let i = 0; i < item.produitbrand.length; i++) {
        if (item.produitbrand[i].brandsubproduit) {
          for (let e = 0; e < item.produitbrand[i].brandsubproduit[e].length; e++) {
            item.produitbrand[i].brandsubproduit[e].codeproduct == this.codebar
          }
        }
      }
    });
})

Any orientation ? Thank you.

Update : This is my error : Error message

if is a statement. You cannot use it with || as part of an expression — adiga
– adiga, Commented Nov 28, 2019 at 15:37

niry · Accepted Answer · 2019-11-30 07:51:32Z

`if` and `for` statements are not allowed inside an expression.

return ( starts an expression.

If I understand correctly what you are trying to do, this is how you should write it:

return this.produits.filter((item) => {
  if (item.codeproduct == this.codebar) {
    return true;
  } 
  if (item.produitbrand) {
    for (let i = 0; i < item.produitbrand.length; i++) {         
      if (item.produitbrand[i].brandsubproduit) {
        for (let e = 0; e < item.produitbrand[i].brandsubproduit.length; e++) {         
          if (item.produitbrand[i].brandsubproduit[e].codeproduct == this.codebar) {
            return true;
          }
        }
      }
    }
  }
  return false;
});

It is really matter of style, but this is how I would write it:

return this.produits.filter(item => {
  if (item.codeproduct == this.codebar) return true;
  for (let { brandsubproduit } of item.produitbrand || [])
    for (let { codeproduct } of brandsubproduit || [])
      if (codeproduct == this.codebar) return true;
  return false;
});

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Use conditional inside filter() in vuejs?

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`if` and `for` statements are not allowed inside an expression.

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if and for statements are not allowed inside an expression.

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`if` and `for` statements are not allowed inside an expression.