push and pop not adding arrays in Javascript

Question

I know that shift and unshift is used to remove or add elements at the beginning of an array.Below is the simple Javascript Code.

var arx = ["Plumber",12,14,15,[18,"Try"]];
console.log("The array is :- ",arx);
arx.shift();    // SHIFT removes element from beginning
console.log("The array after shift operation is :- "+arx);
arx.unshift(11,"Try",["ABC",34,"GTH"],999);  ////////////   LINE 1
console.log("The array array unshift operation is :- "+arx);

Below is the output

I am not able to understand why after shift opeartion , my entire array is being displayed in series like that without any square bracket and all. Even the last element which is itself an array [18,'Try'] has been broken into two different elements. Even the unshift opeartion is adding every element one by one and is not adding array ["ABC",34,"GTH"] from line 1 in the form of array.Can anyone tell me what am I doing wrong ?

It's due to how .toString works. You're using + to concatenate the array to a string. Instead try listing the array as a separate argument in console.log? console.log("The array array unshift operation is :- ", arx) — evolutionxbox
– evolutionxbox, Commented Sep 12, 2022 at 8:30
It worked thanks a lot. Btw, can you tell me some good sources to learn javascript.I am newbiee in it. — Brijesh
– Brijesh, Commented Sep 12, 2022 at 8:37

Foucauld Gaudin · Accepted Answer · 2022-09-12 09:03:58Z

1

If you notice, in your console.logs you are adding "+" sign before arx. Try replacing it with a comma

var arx = ["Plumber",12,14,15,[18,"Try"]];
console.log("The array is :- ",arx);
arx.shift();    // SHIFT removes element from beginning
console.log("The array after shift operation is :- ",arx);
arx.unshift(11,"Try",["ABC",34,"GTH"],999);  ////////////   LINE 1
console.log("The array array unshift operation is :- ",arx);

answered Sep 12, 2022 at 9:03

Foucauld Gaudin

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3 Comments

Brijesh Over a year ago

Why does + sign makes it like that ??

Foucauld Gaudin Over a year ago

With the + operator where you were using it, you simply were concatenating an array with a string, that's why javascript transformed your array into a string. Try console.log(+arx), the result will be NaN. Another syntax for the console.logs which resulted in the way you didn't want would be : console.log(`The array after shift operation is :- ${arx}`) For concatenation, check out string interpolation (in javascript)

Foucauld Gaudin Over a year ago

for a better understanding of the + operator, check out the most upvoted comment there [stackoverflow.com/questions/7124884/…

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