ejemplo de código de JavaScript de shift unshift

este problema se puede tratar de diversas maneras, pero en este caso te dejamos la que en nuestra opinión es la resolución más completa.

Ejemplo 1: javascript agregar nuevo array elemento al inicio de array

var colors =["white","blue"];
colors.unshift("red");//add red to beginning of colors// colors = ["red","white","blue"]

Ejemplo 2: js agrega elemento al frente de array

//Add element to front of arrayvar numbers =["2","3","4","5"];
numbers.unshift("1");//Result - numbers: ["1", "2", "3", "4", "5"]

Ejemplo 3: array.unshift en javascript

//The unshift() method adds one or more elements to the beginning of an array //and returns the new length of the array.const array1 =[1,2,3];console.log(array1.unshift(4,5));// expected output: 5console.log(array1);// expected output: Array [4, 5, 1, 2, 3]

Ejemplo 4: método unshift en javascript

var name =["john"];
name.unshift("charlie");
name.unshift("joseph","Jane");console.log(name);//Output will be[" joseph "," Jane "," charlie "," john "]

Ejemplo 5: desshift de JavaScript

let array =["A","B"];let variable ="what you want to add";//Add the variable to the beginning of the array
 array.unshift(variable);//===========================console.log(array);//output =>//["what you want to add" ,"A", "B"]

Ejemplo 6: anteponer a array javascript

// Build an array of test data.var data =["X"];// Unshift data onto the array. Unshift() prepends elements to// the beginning of the given array. Note that it can take more// than one argument. In the output, notice that when unshift()// takes multiple arguments, they are prepended in a right-to-left// order (mimicing their appearence in the arguments list).
data.unshift("A");
data.unshift("B","C");// Output resultant array.console.log( data );

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