array.js

/*
var arr1 = [3, 9, "Sampad", -2, false, function greet(){return "Hello world"}];

console.log(arr1);
console.log(arr1.length);
console.log(arr1[0]);
console.log(arr1[2].length);
console.log(arr1[5]);
console.log(arr1[5]());
*/




// array methods

/*
// empty array
// var arr2 = [];
var arr2 = new Array();

arr2.push(9, [6, 2], "Sampriti");   // adding elements at the end of the empty array
console.log(arr2);
arr2.push(-1, 3);
console.log(arr2);

console.log(arr2.pop());  // pops out the last element and returns that element
console.log(arr2);

console.log(arr2.shift()); // removes the first array element and "shifts" all other elements to a lower index.  returns the value that was "shifted out".
console.log(arr2);

console.log(arr2.unshift(10)); // adds a new element to an array (at the beginning), and "unshifts" older elements.
console.log(arr2);

var arr2[1] = [3, 4];  // changing the indexed element
console.log(arr2);

var arr2[arr2.length] = -5;  // adding element at the end of an array using array length
console.log(arr2);
console.log(arr2.length);

// delete arr2[0];    // leaves undefined holes in the array.
// console.log(arr2);
// console.log(arr2.length);

console.log(arr2.at(1));  // returns an indexed element from an array.
console.log(arr2[1]);

console.log(arr2.toString());  // returns an array to a string of (comma separated) array values. orginal array remains unchanged
console.log(typeof((arr2.toString()[0])));
console.log(typeof(arr2[0]));
*/

/*
var arr1 = [5, 7, 6, 4, 8, 1];
var arr2 = [0, 9];
// console.log(arr1.concat(arr2));
// console.log(arr2.concat(arr1));

// console.log(arr1.splice(2)); // returns removed part from index 2 to end
// console.log(arr1);           // modified array after removal of elements

// console.log(arr1.splice(2, 2)); // returns removed part with next 2 elements from index 2.
// console.log(arr1);          // modified array after removal of elements

// console.log(arr1.splice(2, 3, 7, 5)); // returns removed part with next 3 elements from index 2.
// console.log(arr1);            // modified array after replacement

// var arr3 = arr1.toSpliced(2, 2);  // modified array after removal of next 2 elements from index 2
// console.log(arr3);
// console.log(arr1);            // original array remains unchanged

// var arr3 = arr1.slice(2);   // return sliced element with elements from index 2 to end
// console.log(arr3);
// console.log(arr1);      // original array remains unchanged

var arr3 = arr1.slice(2, 4);   // return sliced element with elements from index 2 to (4-1)
console.log(arr3);
console.log(arr1);      // original array remains unchanged
*/


/*
var arr1 = [[1, 3], [2, 4]];
console.log(arr1.flat());         // original array remains unchanged
 
var arr2 = [[[1, 3], [2, 4]], [[5, 7], [6, 8]]];
console.log(arr2.flat());
console.log(arr2.flat().flat());
console.log(arr2);                // original array remains unchanged
*/

/*
var A = Array(5);
console.log(A);
console.log(A.length);
// var A[1]=5;
// console.log(A);

for(var i=0;i<A.length;i++){
    A[i]=i**2;
}
console.log(A);

// for(var i in A){
//     A[i]=i**2;
// }
// console.log(A);
*/

<<<<<<< HEAD
=======
function null_mat3(m,n){
    var M=new Array(m).fill(Array(n).fill(0));
    return M;
}

console.log(null_mat3(5,4))

/*
>>>>>>> 29ec691 (committed)
function null_mat4(m, n){
    // var M = [];
    var M = Array(m);
    for (var i = 0; i < m; i++) {
        M[i] = Array(n);
        for(var j=0;j<n;j++){
            M[i][j]=0;
        }
    }
    return M;
}

<<<<<<< HEAD
console.log(null_mat4(5,4));

=======

console.log(null_mat4(5,4));
*/


/*
>>>>>>> 29ec691 (committed)
function identity_mat3(m, n){
    // var M = [];
    var M = Array(m);
    for (var i = 0; i < m; i++) {
        M[i] = Array(n);
        for(var j=0;j<n;j++){
            M[i][j]=(i===j)*1.0;
        }
    }
    return M;
}

<<<<<<< HEAD
console.log(identity_mat3(4,4));
=======
console.log(identity_mat3(4,4));
*/

/*
var A=Array(6);
for(var i=0;i<6;i++){
    A[i]=Array(5);
}
console.log(A);
console.log(A.length);
console.log(A[0].length);
*/

>>>>>>> 29ec691 (committed)