How do you split an array into array pairs in JavaScript?

Question

I want to split an array into pairs of arrays.

var arr = [2, 3, 4, 5, 6, 4, 3, 5, 5]

would be

var newarr = [
    [2, 3],
           


        

Answer 1

This combines some of the answers above but without Object.fromEntires. The output is similar to what you would get with minimist.

    const splitParameters = (args) => {
      const split = (arg) => (arg.includes("=") ? arg.split("=") : [arg]);
    
      return args.reduce((params, arg) => [...params, ...split(arg)], []);
    };
    
    const createPairs = (args) =>
      Array.from({ length: args.length / 2 }, (_, i) =>
        args.slice(i * 2, i * 2 + 2)
      );
    
    const createParameters = (pairs) =>
      pairs.reduce(
        (flags, value) => ({
          ...flags,
          ...{ [value[0].replace("--", "")]: value[1] }
        }),
        {}
      );
    
    const getCliParameters = (args) => {
      const pairs = createPairs(splitParameters(args));
      const paramaters = createParameters(pairs);
    
      console.log(paramaters);
    
      return paramaters;
    };
 

    //const argsFromNodeCli = process.argv.slice(2); // For node
      
    const testArgs = [
      "--url",
      "https://www.google.com",
      "--phrases=hello,hi,bye,ok"
    ];
    
    const output = getCliParameters(testArgs);
    document.body.innerText = JSON.stringify(output);