For example in
{colour: 'red',x:0,y:20},
{colour: 'orange',x:0,y:40},
{colour: 'yellow',x:0,y:60},
{colour: 'green',x:0,y:80},
{colour: 'blue',x:0,y:90},
{colour: 'purple',x:0,y:100},
{colour: 'pink',x:0,y:120},
{colour: 'brown',x:0,y:140},
{colour: 'white',x:0,y:160},
]
Red is 0, orange is 1, etc.
You can do it like this
var arr = [{colour: 'red',x:0,y:20}, {colour: 'orange',x:0,y:40}, {colour: 'yellow',x:0,y:60}, {colour: 'green',x:0,y:80}, {colour: 'blue',x:0,y:90}, {colour: 'purple',x:0,y:100}, {colour: 'pink',x:0,y:120}, {colour: 'brown',x:0,y:140}, {colour: 'white',x:0,y:160}, ]; var position = arr.findIndex(a=>a.colour == 'orange'); console.log(position);
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