How to delete the first element from es6 array

3 ways to delete: 1. Use shift(), the syntax is "array object.shift()". 2. Use splice() to delete an element with a starting index of 0. The syntax is "array object.splice(0,1)". 3. Use delete to delete the array element with index 0, the syntax is "delete array name[0]".

The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.

Multiple ways to delete the first element from an es6 array

Method 1: Use the shift() function

array.shift() function can delete the first element of the array and return the value of the first element; then shift all remaining elements forward by 1 position to fill the gap at the head of the array.

array.shift() function will change the original array

var a = [1,2,3,4,5,6,7,8]; //定义数组 console.log(a); a.shift(); console.log(a);

##Method 2: Use splice() function

splice(index,len,[item])

replace/delete/addone or several values in the array

• index: Array start subscript  

For example: arr = ['a','b','c','d']

• Delete---- item is not set

• var a = [1,2,3,4,5,6,7,8]; //定义数组 console.log(a); a.splice(0,1); //删除起始下标为0，长度为1的一个值，len设置的1，如果为0，则数组不变 console.log(a);

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Method 3: Use the delete keyword

Use the delete keyword to delete the array element with index 0.

var a = [1,2,3,4,5,6,7,8]; //定义数组 console.log(a); delete a[0]; //删除下标为0的元素 console.log(a);

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