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straightLine.js

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/**

* @param {number[][]} coordinates

* @return {boolean}

*/

const checkStraightLine = function (coordinates) {

let currCoordinate = coordinates[0];

let nextCoordinate = coordinates[1];

let xCoordinateDiffPrev = nextCoordinate[0] - currCoordinate[0];

let yCoordinateDiffPrev = nextCoordinate[1] - currCoordinate[1];

let slopePrev = yCoordinateDiffPrev / xCoordinateDiffPrev;

for (let i = 1; i < coordinates.length - 1; i++) {

currCoordinate = coordinates[i];

nextCoordinate = coordinates[i + 1];

xCoordinateDiffCur = nextCoordinate[0] - currCoordinate[0];

yCoordinateDiffCur = nextCoordinate[1] - currCoordinate[1];

let slopeCur = yCoordinateDiffCur / xCoordinateDiffCur;

if (Math.abs(slopeCur) === Infinity && Math.abs(slopePrev === Infinity)) continue;

if (slopeCur !== slopePrev) return false;

slopePrev = slopeCur;

}

return true;

};

const coordinates = [

[0, 0],

[0, 1],

[0, -1]

];

console.log(checkStraightLine(coordinates));