I have an object array in my angular (typescript) Project.
let a = [{min:0, max:10},{min:10, max:810},{min:-10, max:110}];
So I want to get minimum of min, and maximum of the max items. I need two variables like following:
let min = // minimum of all items min property = -10;
let max = // maximum of all items max property = 810;
can I do this using lambda or other ways practically?
You can use map to get all min/max values. Use Math.min and Math.max to get the values.
let a = [{min:0, max:10},{min:10, max:810},{min:-10, max:110}];
let min = Math.min(...a.map(o => o.min));
let max = Math.max(...a.map(o => o.max));
console.log(min);
console.log(max);Another option is using reduce. This option only needs to loop the array once.
let a = [{min:0, max:10},{min:10, max:810},{min:-10, max:110}];
let min = a.reduce((c, v) => v.min < c ? v.min : c, 0);
let max = a.reduce((c, v) => v.max > c ? v.max : c, 0);
console.log(min);
console.log(max);
let min = Math.min(...a.map((item)=>{return item.min}))
let max = Math.max(...a.map((item)=>{return item.max}))
Try this:
let a = [{min:0, max:10},{min:10, max:810},{min:-10, max:110}];
let min = Math.min(...a.map(value => value.min));
let max = Math.max(...a.map(value => value.max));
_is a library that is not part of native javaScript. If using underscore this would be a good answer. However, since OP is not asking about underscore/lodash I think this answer is not correct.