如果检查的值在嵌套数组中，如何获取数组的索引？

Question

I have an array like this

const myArray = [ [ false ], [ true ], [ false ] ] 

i want to get index of an element that has value == true from array above.

so because the true from array above is in the second element, then I want to get 1 as the index result

how to do that?

Answer 1

You just need add filter for this,

const myArray = [ [ false ], [ true ], [ false ] ] 

let result = myArray.filter(function(value) {
    return value[0]=== true;
});

Answer 2

const arrays = [ [ false ], [ true ], [ false ] ] 

const index = [].concat.apply([], arrays).findIndex(value => value === true)

Answer 3

const idx = myArray.findIndex(i => i[0]);

Answer 4

you can loop on your array with map method

const arr = [ [ false ], [ true ], [ false ] ] 

arr.map((item, index) => {

if (item[0]) {
  console.log(index)
}

})