Remove square brackets from a text using JavaScript

Question

I have this ajax function returns data as in plain text form.

        $.ajax({
            type: 'GET',
            url: "/addObstacles",
            cache: false,   
            datatype: "text/plain",
            success: function (data) {
                var obstacles = data.split('\n');
                for(var i = 0;i < obstacles.length;i++){
                    if(!obstacles[i] == ''){
                        console.log(obstacles[i]);
                    }
                }
            }
        });

console.log(obstacles[i]):

[[90, 90], [90, 112], [100, 112], [100, 100], [200, 100], [200, 125], [240, 125], [240, 121]]

I want to get rid of all square brackets and the commas after every element and it should look like this:

90,90 90,112 100,112 100,100 200,100 200,125 240,125 240,121

As this data will be the points for drawing a SVG polyline dynamically. I tried many regex and strip() but no luck.

obstacles[i].replace(/(\[.*?\])/g, ''); ,obstacles[i].replace(/ *\[[^\]]*]/g, ''); I tried these. — Shyam3089
– Shyam3089, Commented May 12, 2020 at 12:23

prasanth · Accepted Answer · 2020-05-12 12:44:35Z

3

Try with Array#flat method

const arr = [[90, 90], [90, 112], [100, 112], [100, 100], [200, 100], [200, 125], [240, 125], [240, 121]];

const res = arr.flat();


//for your desire result
let start = res.shift();
let end   = res.pop();
let center= res.reduce((acc,b,i)=>{
   let l = i+1;
   if(l%2 == 0){
    acc.push(`${res[i-1]} ${b}`)
   }
   return acc
},[])


console.log(start+','+center.join(',')+','+end)

edited May 12, 2020 at 12:44

answered May 12, 2020 at 12:13

prasanth

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3 Comments

Shyam3089 Over a year ago

This throws an error arr.flat is not a function . obstacles[i] is not an array it's just a text returned by python after reading a text file.

prasanth Over a year ago

@Shyam3089 .is that text file but all in above same format [[n,n]...] like this. Better try with JSON.parse(obstacles[i]).falt(). if still not working please post obstacles

Shyam3089 Over a year ago

@Prasanth Thanks. Now above code give this: Array(16) [ 90, 90, 90, 112, 100, 112, 100, 100, 200, 100, … ] May be I can remove commas after every 2 elements to get desired structure.

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