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javascriptlodash

Find index of any array using value in string array

a=[
    {x:1,y:1,i:"Piechart1"},
    {x:2,y:1,i:"Piechart2"},
    {x:3,y:1,i:"Piechart3"}
]

str=["Piechart1","Piechart3"];

I want get index by comparing array string.Output in above example should be [0,2] Could you please let me know how to achieve in lodash ,javascript

Solution

  • Use .map() to map the strings to their index, and .findIndex inside the .map() callback to locate the index of the object.

    var a = [{x:1,y:1,i:"Piechart1"},{x:2,y:1,i:"Piechart2"},{x:3,y:1,i:"Piechart3"}];

var str = ["Piechart1","Piechart3"];

var res = str.map(s => a.findIndex(o => o.i == s));

console.log(res);

    You can chain .filter(idx => idx != -1) on the end if there's any chance of one of the strings not being in the main array.