20201114 how to change the key of object to a array or another key? / Alex

Published unlisted

Edited

Nov 15, 2020

md`# 20201114 how to change the key of object to a array or another key?`

// require D3 library

d3 = require('d3');

mat = FileAttachment("Book1.csv")

// get the matrix from mat

data = d3.csvParse(await mat.text());

md`## what should I do if I want to change the key 'step' of all these 9 objects to an array like [0,1,2], or to another key, like 'step_2'`

md`---

## kind answers from the users`

// directly modify in the data read sections

data1 = d3.csvParse(await mat.text(), row => {

row['step'] = [1, 2, 3];

return row;

})

updatedData = data.map(d => {

// shallow copy so that we don't modify the objects in `data`, can be used in the main codes

const obj = {...d};

obj['step'] = [0, 1, 2];

return obj;

})

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