Agregue el elemento al final de la matriz sin usar push ()

var myArr = [['Ahmed', 300], 15, 'Third item']; // declare array.
myArr[myArr.length] = ['Omar', 350];
myArr[myArr.length] = ['Ali', 30];
console.log(myArr); // show: myArr = [['Ahmed', 300], 15, 'Third item', ['Omar', 350], ['Ali', 30]]
Omar ELmoez