​

let T = [2,3,-1]

​

function forEach(array, fx) {

  for (var i = 0; i < array.length; i++)

    fx(array[i]);

}

​

function affVal(v){

    console.log(`val tab : ${v} `)

}

​

forEach(T, affVal);

​

forEach(T, function (v){

  console.log(`-> tab : ${v} `);

});

​

​

function Positif(v){

    if (v>0) console.log(` val positif : ${v} `);

}

​

forEach(T, Positif);

​