Insert a row of elements into a multi-dimensional array based on index

Question

Insert a row of elements into a multi-dimensional array based on index

For Example:

MultiArray = new Array(5);
MultiArray [0] = new Array(2);
MultiArray [0][0] = "Tom";
MultiArray [0][1] = "scientist";
MultiArray [1] = new Array(3);
MultiArray [1][0] = "Beryl";
MultiArray [1][1] = "engineer";
MultiArray [1][2] = "Doctor";
MultiArray [2] = new Array(2);
MultiArray [2][0] = "Ann";
MultiArray [2][1] = "surgeon";
MultiArray [3] = new Array(2);
MultiArray [3][0] = "Bill";
MultiArray [3][1] = "taxman";
MultiArray [4] = new Array(2);
MultiArray [4][0] = "Myrtal";
MultiArray [4][1] = "bank robber";
MultiArray.splice(1,0, new Array(2){"two","one"});

The last line in my code didn't work. I am not sure if the rest of the code is right neither.

Now can anyone please let me know whether I can insert a row of elements somewhere in between and move the remaining elements one index down?

• JB Nizet: java != javascript. I removed the java tag.
• Yury Tarabanko: @Sushil why? It's absolutely ok to write new Array(10)
• Yury Tarabanko: @Sushil: No, its not :). Go ahead and try: var a = new Array(10); console.log(a.join("wat"));
• Freakyuser: MultiArray.splice(1,0, MultiArray.splice(2,1) ); Is this allowed? I tried this because the splice() returns a row of array but its not working.
• Christoph: Raghul, perhaps splice does not what you think it does? Check the splice doc on MDN to make sure. I wrote an example from your code and it works exactly like it should.

Answer 1

You accidently wrote new Array{} which is wrong - your command should be either:

MultiArray.splice(1,0, new Array(2)("two","one")); // no curled brackets!!

or even better

MultiArray.splice(1,0, ["two","one"]);

Altogether, in javascript the new Array() notation should be avoided (js automatically controls the dimension of it's arrays, no need to preallocate or declare it). Instead you can write:

MultiArray = [];

So, you can directly write:

MultiArray = [[ "Tom","scientist"],["Beryl","engineer","Doctor"],
 ["Ann","surgeon"],["Bill","taxman"],["Myrtal","bank robber"]];
MultiArray.splice(1,0, ["two","one"]);

Answer 2

Try:

MultiArray.splice(1,0, ["two","one"]);