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![// won't work const array = [ { prop: 1 }, { prop: 2 } ]; const indexOfObject = array.indexOf({ prop: 1 }); // => -1 ! // this will work const array = [ { prop: 1 }, { prop: 2 } ]; const indexOfObject = array.findIndex((element) => element.prop === 1); // => 0 !](https://pbs.twimg.com/media/FRvU837WYAE9DK-.jpg?name=orig)
ALT // won't work const array = [ { prop: 1 }, { prop: 2 } ]; const indexOfObject = array.indexOf({ prop: 1 }); // => -1 ! // this will work const array = [ { prop: 1 }, { prop: 2 } ]; const indexOfObject = array.findIndex((element) => element.prop === 1); // => 0 !
![JavaScript code snippet: const makeup = ["Lipstick", "Eyeliner", "Mascara", "Foundation"]; const skincare = ["Moisturizer", "Toner", "Cleanser"]; const cosmetics = [...makeup, ...skincare]; // Thanks to the spread operator, extracting elements from array can be easier! console.log(cosmetics); // This outputs: ["Lipstick", "Eyeliner", "Mascara", "Foundation", "Moisturizer", "Toner", "Cleanser"]](https://pbs.twimg.com/media/FPrQvPbXwAM9wdl.jpg?name=orig)
ALT JavaScript code snippet: const makeup = ["Lipstick", "Eyeliner", "Mascara", "Foundation"]; const skincare = ["Moisturizer", "Toner", "Cleanser"]; const cosmetics = [...makeup, ...skincare]; // Thanks to the spread operator, extracting elements from array can be easier! console.log(cosmetics); // This outputs: ["Lipstick", "Eyeliner", "Mascara", "Foundation", "Moisturizer", "Toner", "Cleanser"]