js add element to array first code example

Example 1: javascript add new array element to start of array

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

Example 2: javascript append how first element

// 2018+ Version
parentElement.prepend(newFirstChild)

Example 3: js add element to front of array

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

Example 4: prepend to 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 );

Example 5: how to make and add to an array in javascript

var arrayExample = [53,'Hello World!'];
console.log(arrayExample) //Output =>
[53,'Hello World!']

//You can also do this
arrayExample.push(true);

console.log(arrayExample); //Output =>
[53,'Hello World!',true];

Example 6: javascript append how first element

var eElement; // some E DOM instance
var newFirstElement; //element which should be first in E

eElement.insertBefore(newFirstElement, eElement.firstChild);