Add property to all objects in array

This question already has an answer here:

For-each over an array in JavaScript? 23 answers

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使用forEach功能：

var array = [{ 'a': '12', 'b': '10' }, { 'a': '20', 'b': '22' }];

array.forEach(function(e) { e.c = +e.b - +e.a });
   
document.write(JSON.stringify(array));

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you can use array.map,

and you should use Number() to convert props to numbers for adding:

var array = [ {'a': '12', 'b':'10'}, {'a': '20', 'b':'22'} ];

var r = array.map( x => {
  x.c = Number(x.b) - Number(x.a);
  return x
  })

console.log(r)

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