Map en action

1. function alphabetRange (start, end, step = 1) {
2.   return new Array(Math.ceil((end.charCodeAt(0) - start.charCodeAt(0))/step))
3.   .fill(start.charCodeAt(0))
4.   .map((x, i) => String.fromCharCode(i*step + start.charCodeAt(0)));
5. }
6. 
   
7. console.log(alphabetRange('c', 'h', 2));

code

Map en action

let p = '<h1>escapeForHTML<h1>';



let regex = /[<>&]/gi;



let r = new Map([
  ['>','&gt;'],

  ['&','&amp;'],

  ['<', '&lt;'],

]);


let f = c => r.get(c)


document.body.insertAdjacentHTML("afterbegin",p);

document.body.insertAdjacentHTML("afterbegin",p.replace(regex,f));

transformer le code

const B=[
  [1,2,3],
  [4,5,6],
];

// c = col, l = lig
function maxi(A){
      let maxC = [];
      for( let c=0; c < A[0].length; c++){ // A[0]=indique la dim
          let tmp = [];
          let max = -10000; //  
          for ( let l=0; l < A.length; l++){
                 tmp.push(A[l][c]); 
                 if ( max < A[l][c] ) max = A[l][c];
          }
          console.log(tmp);
          //console.log(Math.max(...tmp)); //top version
          console.log(max);
          maxC.push(max);
      }
      console.log(maxC);
      return maxC;

}

console.log(`les valeurs Max par colonnes : ${maxi(B)}`);

Remplacer ce code avec reduce et map